390280390 has 64 divisors (see below), whose sum is σ = 776355840. Its totient is φ = 140613120.

The previous prime is 390280381. The next prime is 390280409. The reversal of 390280390 is 93082093.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 542451 + ... + 543169.

It is an arithmetic number, because the mean of its divisors is an integer number (12130560).

Almost surely, 2^390280390 is an apocalyptic number.

390280390 is a deficient number, since it is larger than the sum of its proper divisors (386075450).

390280390 is a wasteful number, since it uses less digits than its factorization.

390280390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 390280390 is about 19755.5154324052. The cubic root of 390280390 is about 730.7894068810.

The spelling of 390280390 in words is "three hundred ninety million, two hundred eighty thousand, three hundred ninety".