40239994 has 8 divisors (see below), whose sum is σ = 62441460. Its totient is φ = 19426176.

The previous prime is 40239971. The next prime is 40240007. The reversal of 40239994 is 49993204.

It can be written as a sum of positive squares in 2 ways, for example, as 37638225 + 2601769 = 6135^2 + 1613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346839 + ... + 346954.

Almost surely, 2^40239994 is an apocalyptic number.

40239994 is a deficient number, since it is larger than the sum of its proper divisors (22201466).

40239994 is a wasteful number, since it uses less digits than its factorization.

40239994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693824.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 40239994 is about 6343.5001379365. The cubic root of 40239994 is about 342.6777992433.

The spelling of 40239994 in words is "forty million, two hundred thirty-nine thousand, nine hundred ninety-four".