39940438 has 4 divisors (see below), whose sum is σ = 59910660. Its totient is φ = 19970218.

The previous prime is 39940409. The next prime is 39940469. The reversal of 39940438 is 83404993.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 39940438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985108 + ... + 9985111.

It is an arithmetic number, because the mean of its divisors is an integer number (14977665).

Almost surely, 2^39940438 is an apocalyptic number.

39940438 is a deficient number, since it is larger than the sum of its proper divisors (19970222).

39940438 is a wasteful number, since it uses less digits than its factorization.

39940438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19970221.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 39940438 is about 6319.8447765748. The cubic root of 39940438 is about 341.8253556983.

The spelling of 39940438 in words is "thirty-nine million, nine hundred forty thousand, four hundred thirty-eight".