390505870 has 16 divisors (see below), whose sum is σ = 711380880. Its totient is φ = 154320064.

The previous prime is 390505849. The next prime is 390505873. The reversal of 390505870 is 78505093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390505873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234415 + ... + 236074.

It is an arithmetic number, because the mean of its divisors is an integer number (44461305).

Almost surely, 2^390505870 is an apocalyptic number.

390505870 is a deficient number, since it is larger than the sum of its proper divisors (320875010).

390505870 is a wasteful number, since it uses less digits than its factorization.

390505870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470579.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 390505870 is about 19761.2213691361. The cubic root of 390505870 is about 730.9301148411.

The spelling of 390505870 in words is "three hundred ninety million, five hundred five thousand, eight hundred seventy".