390042824 has 8 divisors (see below), whose sum is σ = 731330310. Its totient is φ = 195021408.

The previous prime is 390042817. The next prime is 390042841. The reversal of 390042824 is 428240093.

It can be written as a sum of positive squares in only one way, i.e., 315772900 + 74269924 = 17770^2 + 8618^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24377669 + ... + 24377684.

Almost surely, 2^390042824 is an apocalyptic number.

It is an amenable number.

390042824 is a deficient number, since it is larger than the sum of its proper divisors (341287486).

390042824 is a wasteful number, since it uses less digits than its factorization.

390042824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48755359 (or 48755355 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 390042824 is about 19749.5018671358. The cubic root of 390042824 is about 730.6410981619.

The spelling of 390042824 in words is "three hundred ninety million, forty-two thousand, eight hundred twenty-four".