38905649 has 4 divisors (see below), whose sum is σ = 38971200. Its totient is φ = 38840100.

The previous prime is 38905637. The next prime is 38905661. The reversal of 38905649 is 94650983.

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 an interprime number because it is at equal distance from previous prime (38905637) and next prime (38905661).

It is a cyclic number.

It is not a de Polignac number, because 38905649 - 2⁸ = 38905393 is a prime.

It is a super-2 number, since 2×38905649² = 3027299048222402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38905609) 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, 31877 + ... + 33074.

It is an arithmetic number, because the mean of its divisors is an integer number (9742800).

Almost surely, 2^38905649 is an apocalyptic number.

It is an amenable number.

38905649 is a deficient number, since it is larger than the sum of its proper divisors (65551).

38905649 is an equidigital number, since it uses as much as digits as its factorization.

38905649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65550.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 38905649 is about 6237.4392983018. The cubic root of 38905649 is about 338.8474498028.

The spelling of 38905649 in words is "thirty-eight million, nine hundred five thousand, six hundred forty-nine".