38157440 has 32 divisors (see below), whose sum is σ = 91221660. Its totient is φ = 15262720.

The previous prime is 38157439. The next prime is 38157443. The reversal of 38157440 is 4475183.

It can be written as a sum of positive squares in 2 ways, for example, as 37650496 + 506944 = 6136^2 + 712^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 38157397 and 38157406.

It is not an unprimeable number, because it can be changed into a prime (38157443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29171 + ... + 30450.

Almost surely, 2^38157440 is an apocalyptic number.

It is an amenable number.

38157440 is an abundant number, since it is smaller than the sum of its proper divisors (53064220).

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

38157440 is an equidigital number, since it uses as much as digits as its factorization.

38157440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59640 (or 59628 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 38157440 is about 6177.1708734663. The cubic root of 38157440 is about 336.6612074184.

The spelling of 38157440 in words is "thirty-eight million, one hundred fifty-seven thousand, four hundred forty".