1381439340 has 96 divisors (see below), whose sum is σ = 4484712960. Its totient is φ = 352363968.

The previous prime is 1381439321. The next prime is 1381439341. The reversal of 1381439340 is 439341831.

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 = 1381439295 and 1381439304.

It is not an unprimeable number, because it can be changed into a prime (1381439341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43194 + ... + 68033.

It is an arithmetic number, because the mean of its divisors is an integer number (46715760).

Almost surely, 2^1381439340 is an apocalyptic number.

1381439340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381439340 is an abundant number, since it is smaller than the sum of its proper divisors (3103273620).

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

1381439340 is a wasteful number, since it uses less digits than its factorization.

1381439340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111268 (or 111260 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1381439340 is about 37167.7190583442. The cubic root of 1381439340 is about 1113.7232169414.

The spelling of 1381439340 in words is "one billion, three hundred eighty-one million, four hundred thirty-nine thousand, three hundred forty".