351992421 has 24 divisors (see below), whose sum is σ = 568189440. Its totient is φ = 208123200.

The previous prime is 351992411. The next prime is 351992449. The reversal of 351992421 is 124299153.

It is not a de Polignac number, because 351992421 - 2¹⁸ = 351730277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351992411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39301 + ... + 47418.

It is an arithmetic number, because the mean of its divisors is an integer number (23674560).

Almost surely, 2^351992421 is an apocalyptic number.

It is an amenable number.

351992421 is a deficient number, since it is larger than the sum of its proper divisors (216197019).

351992421 is a wasteful number, since it uses less digits than its factorization.

351992421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86777 (or 86774 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 351992421 is about 18761.4610571778. The cubic root of 351992421 is about 706.0645995080.

The spelling of 351992421 in words is "three hundred fifty-one million, nine hundred ninety-two thousand, four hundred twenty-one".