390429251990 has 32 divisors (see below), whose sum is σ = 706835156544. Its totient is φ = 155271029760.

The previous prime is 390429251977. The next prime is 390429251999. The reversal of 390429251990 is 99152924093.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390429251999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1355687 + ... + 1618253.

It is an arithmetic number, because the mean of its divisors is an integer number (22088598642).

Almost surely, 2^390429251990 is an apocalyptic number.

390429251990 is a deficient number, since it is larger than the sum of its proper divisors (316405904554).

390429251990 is a wasteful number, since it uses less digits than its factorization.

390429251990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263432.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The spelling of 390429251990 in words is "three hundred ninety billion, four hundred twenty-nine million, two hundred fifty-one thousand, nine hundred ninety".