390121765 has 32 divisors (see below), whose sum is σ = 528135552. Its totient is φ = 274176000.

The previous prime is 390121759. The next prime is 390121769. The reversal of 390121765 is 567121093.

It is not a de Polignac number, because 390121765 - 2⁵ = 390121733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 390121765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390121769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254050 + ... + 255580.

It is an arithmetic number, because the mean of its divisors is an integer number (16504236).

Almost surely, 2^390121765 is an apocalyptic number.

It is an amenable number.

390121765 is a deficient number, since it is larger than the sum of its proper divisors (138013787).

390121765 is a wasteful number, since it uses less digits than its factorization.

390121765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 390121765 is about 19751.5003227603. The cubic root of 390121765 is about 730.6903864663.

The spelling of 390121765 in words is "three hundred ninety million, one hundred twenty-one thousand, seven hundred sixty-five".