38409639 has 4 divisors (see below), whose sum is σ = 51212856. Its totient is φ = 25606424.

The previous prime is 38409619. The next prime is 38409653. The reversal of 38409639 is 93690483.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38409639 - 2⁸ = 38409383 is a prime.

It is a super-2 number, since 2×38409639² = 2950600736220642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38409639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38409619) 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, 6401604 + ... + 6401609.

It is an arithmetic number, because the mean of its divisors is an integer number (12803214).

Almost surely, 2^38409639 is an apocalyptic number.

38409639 is a deficient number, since it is larger than the sum of its proper divisors (12803217).

38409639 is a wasteful number, since it uses less digits than its factorization.

38409639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12803216.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 38409639 is about 6197.5510485998. The cubic root of 38409639 is about 337.4012923961.

The spelling of 38409639 in words is "thirty-eight million, four hundred nine thousand, six hundred thirty-nine".