38439947 has 16 divisors (see below), whose sum is σ = 47480832. Its totient is φ = 30304800.

The previous prime is 38439931. The next prime is 38439949. The reversal of 38439947 is 74993483.

It is a cyclic number.

It is not a de Polignac number, because 38439947 - 2⁴ = 38439931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38439949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32822 + ... + 33972.

It is an arithmetic number, because the mean of its divisors is an integer number (2967552).

Almost surely, 2^38439947 is an apocalyptic number.

38439947 is a deficient number, since it is larger than the sum of its proper divisors (9040885).

38439947 is a wasteful number, since it uses less digits than its factorization.

38439947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538.

The product of its digits is 653184, while the sum is 47.

The square root of 38439947 is about 6199.9957258050. The cubic root of 38439947 is about 337.4900137877.

The spelling of 38439947 in words is "thirty-eight million, four hundred thirty-nine thousand, nine hundred forty-seven".