390428997 has 8 divisors (see below), whose sum is σ = 594939456. Its totient is φ = 223102272.

The previous prime is 390428993. The next prime is 390429029. The reversal of 390428997 is 799824093.

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

It is not a de Polignac number, because 390428997 - 2² = 390428993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390428993) 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, 9295908 + ... + 9295949.

It is an arithmetic number, because the mean of its divisors is an integer number (74367432).

Almost surely, 2^390428997 is an apocalyptic number.

It is an amenable number.

390428997 is a deficient number, since it is larger than the sum of its proper divisors (204510459).

390428997 is a wasteful number, since it uses less digits than its factorization.

390428997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18591867.

The product of its (nonzero) digits is 979776, while the sum is 51.

The square root of 390428997 is about 19759.2762266233. The cubic root of 390428997 is about 730.8821492983.

The spelling of 390428997 in words is "three hundred ninety million, four hundred twenty-eight thousand, nine hundred ninety-seven".