390553391421 has 16 divisors (see below), whose sum is σ = 578819491200. Its totient is φ = 260269084224.

The previous prime is 390553391411. The next prime is 390553391441. The reversal of 390553391421 is 124193355093.

390553391421 is a `hidden beast` number, since 3 + 9 + 0 + 5 + 533 + 91 + 4 + 21 = 666.

It is not a de Polignac number, because 390553391421 - 2¹⁰ = 390553390397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390553391411) 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, 2701681 + ... + 2842566.

It is an arithmetic number, because the mean of its divisors is an integer number (36176218200).

Almost surely, 2^390553391421 is an apocalyptic number.

It is an amenable number.

390553391421 is a deficient number, since it is larger than the sum of its proper divisors (188266099779).

390553391421 is a wasteful number, since it uses less digits than its factorization.

390553391421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546865 (or 5546859 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The spelling of 390553391421 in words is "three hundred ninety billion, five hundred fifty-three million, three hundred ninety-one thousand, four hundred twenty-one".