43399904 has 12 divisors (see below), whose sum is σ = 85443624. Its totient is φ = 21699936.

The previous prime is 43399901. The next prime is 43399913. The reversal of 43399904 is 40999334.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43399901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678092 + ... + 678155.

It is an arithmetic number, because the mean of its divisors is an integer number (7120302).

Almost surely, 2^43399904 is an apocalyptic number.

It is an amenable number.

43399904 is a deficient number, since it is larger than the sum of its proper divisors (42043720).

43399904 is a wasteful number, since it uses less digits than its factorization.

43399904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356257 (or 1356249 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 43399904 is about 6587.8603506753. The cubic root of 43399904 is about 351.4225207561.

The spelling of 43399904 in words is "forty-three million, three hundred ninety-nine thousand, nine hundred four".