390840042 has 8 divisors (see below), whose sum is σ = 781680096. Its totient is φ = 130280012.

The previous prime is 390840041. The next prime is 390840049. The reversal of 390840042 is 240048093.

It is a happy number.

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

390840042 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 390839991 and 390840009.

It is not an unprimeable number, because it can be changed into a prime (390840041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32569998 + ... + 32570009.

It is an arithmetic number, because the mean of its divisors is an integer number (97710012).

Almost surely, 2^390840042 is an apocalyptic number.

390840042 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

390840042 is a wasteful number, since it uses less digits than its factorization.

390840042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65140012.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 390840042 is about 19769.6748076442. The cubic root of 390840042 is about 731.1385510916.

The spelling of 390840042 in words is "three hundred ninety million, eight hundred forty thousand, forty-two".