38997561 has 4 divisors (see below), whose sum is σ = 51996752. Its totient is φ = 25998372.

The previous prime is 38997533. The next prime is 38997577. The reversal of 38997561 is 16579983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 38997561 - 2²² = 34803257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38997561.

It is not an unprimeable number, because it can be changed into a prime (38997061) 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, 6499591 + ... + 6499596.

It is an arithmetic number, because the mean of its divisors is an integer number (12999188).

Almost surely, 2^38997561 is an apocalyptic number.

It is an amenable number.

38997561 is a deficient number, since it is larger than the sum of its proper divisors (12999191).

38997561 is a wasteful number, since it uses less digits than its factorization.

38997561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12999190.

The product of its digits is 408240, while the sum is 48.

The square root of 38997561 is about 6244.8027190617. The cubic root of 38997561 is about 339.1140747825.

The spelling of 38997561 in words is "thirty-eight million, nine hundred ninety-seven thousand, five hundred sixty-one".