40239864 has 48 divisors (see below), whose sum is σ = 124553520. Its totient is φ = 11496960.

The previous prime is 40239847. The next prime is 40239869. The reversal of 40239864 is 46893204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40239869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39417 + ... + 40424.

It is an arithmetic number, because the mean of its divisors is an integer number (2594865).

Almost surely, 2^40239864 is an apocalyptic number.

It is an amenable number.

40239864 is an abundant number, since it is smaller than the sum of its proper divisors (84313656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40239864 is a wasteful number, since it uses less digits than its factorization.

40239864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79860 (or 79853 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 40239864 is about 6343.4898912192. The cubic root of 40239864 is about 342.6774302227.

The spelling of 40239864 in words is "forty million, two hundred thirty-nine thousand, eight hundred sixty-four".