38400139 has 4 divisors (see below), whose sum is σ = 38514424. Its totient is φ = 38285856.

The previous prime is 38400107. The next prime is 38400157. The reversal of 38400139 is 93100483.

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 38400139 - 2⁵ = 38400107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38406139) 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, 56637 + ... + 57310.

It is an arithmetic number, because the mean of its divisors is an integer number (9628606).

Almost surely, 2^38400139 is an apocalyptic number.

38400139 is a deficient number, since it is larger than the sum of its proper divisors (114285).

38400139 is a wasteful number, since it uses less digits than its factorization.

38400139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114284.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 38400139 is about 6196.7845694360. The cubic root of 38400139 is about 337.3734731936.

The spelling of 38400139 in words is "thirty-eight million, four hundred thousand, one hundred thirty-nine".