1381436028 has 216 divisors, whose sum is σ = 4302305280. Its totient is φ = 371891520.

The previous prime is 1381436027. The next prime is 1381436039. The reversal of 1381436028 is 8206341831.

1381436028 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 43 + 602 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1381435983 and 1381436001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381436027) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3204973 + ... + 3205403.

It is an arithmetic number, because the mean of its divisors is an integer number (19918080).

Almost surely, 2^1381436028 is an apocalyptic number.

1381436028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381436028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2151152640).

1381436028 is an abundant number, since it is smaller than the sum of its proper divisors (2920869252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381436028 is a wasteful number, since it uses less digits than its factorization.

1381436028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1381436028 is about 37167.6745035252. The cubic root of 1381436028 is about 1113.7223268905.

Adding to 1381436028 its reverse (8206341831), we get a palindrome (9587777859).

The spelling of 1381436028 in words is "one billion, three hundred eighty-one million, four hundred thirty-six thousand, twenty-eight".