1381957380 has 72 divisors (see below), whose sum is σ = 4194963864. Its totient is φ = 368256000.

The previous prime is 1381957373. The next prime is 1381957399. The reversal of 1381957380 is 837591831.

It can be written as a sum of positive squares in 4 ways, for example, as 66879684 + 1315077696 = 8178^2 + 36264^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491980 + ... + 494780.

It is an arithmetic number, because the mean of its divisors is an integer number (58263387).

Almost surely, 2^1381957380 is an apocalyptic number.

1381957380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381957380 is an abundant number, since it is smaller than the sum of its proper divisors (2813006484).

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

1381957380 is a wasteful number, since it uses less digits than its factorization.

1381957380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557 (or 5552 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1381957380 is about 37174.6873557801. The cubic root of 1381957380 is about 1113.8624150118.

The spelling of 1381957380 in words is "one billion, three hundred eighty-one million, nine hundred fifty-seven thousand, three hundred eighty".