38978506 has 16 divisors (see below), whose sum is σ = 66969216. Its totient is φ = 16667856.

The previous prime is 38978477. The next prime is 38978507. The reversal of 38978506 is 60587983.

It is not an unprimeable number, because it can be changed into a prime (38978507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3960 + ... + 9676.

It is an arithmetic number, because the mean of its divisors is an integer number (4185576).

Almost surely, 2^38978506 is an apocalyptic number.

38978506 is a deficient number, since it is larger than the sum of its proper divisors (27990710).

38978506 is a wasteful number, since it uses less digits than its factorization.

38978506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6213.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 38978506 is about 6243.2768639553. The cubic root of 38978506 is about 339.0588331103.

It can be divided in two parts, 3897 and 8506, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 38978506 in words is "thirty-eight million, nine hundred seventy-eight thousand, five hundred six".