1381335426 has 48 divisors (see below), whose sum is σ = 3128688576. Its totient is φ = 439626528.

The previous prime is 1381335421. The next prime is 1381335433. The reversal of 1381335426 is 6245331831.

1381335426 is a `hidden beast` number, since 1 + 3 + 81 + 33 + 542 + 6 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1381335421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251061 + ... + 256503.

It is an arithmetic number, because the mean of its divisors is an integer number (65181012).

Almost surely, 2^1381335426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381335426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1564344288).

1381335426 is an abundant number, since it is smaller than the sum of its proper divisors (1747353150).

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

1381335426 is a wasteful number, since it uses less digits than its factorization.

1381335426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6087 (or 6084 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 1381335426 is about 37166.3211254490. The cubic root of 1381335426 is about 1113.6952909146.

The spelling of 1381335426 in words is "one billion, three hundred eighty-one million, three hundred thirty-five thousand, four hundred twenty-six".