39918457 has 4 divisors (see below), whose sum is σ = 40107856. Its totient is φ = 39729060.

The previous prime is 39918443. The next prime is 39918467. The reversal of 39918457 is 75481993.

It is a happy number.

39918457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75481993 = 31 ⋅2434903.

It is a cyclic number.

It is not a de Polignac number, because 39918457 - 2¹⁹ = 39394169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39918407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94383 + ... + 94804.

It is an arithmetic number, because the mean of its divisors is an integer number (10026964).

Almost surely, 2^39918457 is an apocalyptic number.

It is an amenable number.

39918457 is a deficient number, since it is larger than the sum of its proper divisors (189399).

39918457 is a wasteful number, since it uses less digits than its factorization.

39918457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189398.

The product of its digits is 272160, while the sum is 46.

The square root of 39918457 is about 6318.1054913637. The cubic root of 39918457 is about 341.7626369575.

The spelling of 39918457 in words is "thirty-nine million, nine hundred eighteen thousand, four hundred fifty-seven".