402668421 has 12 divisors (see below), whose sum is σ = 550312416. Its totient is φ = 261894880.

The previous prime is 402668417. The next prime is 402668423. The reversal of 402668421 is 124866204.

It is not a de Polignac number, because 402668421 - 2² = 402668417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402668423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34881 + ... + 44966.

It is an arithmetic number, because the mean of its divisors is an integer number (45859368).

Almost surely, 2^402668421 is an apocalyptic number.

402668421 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

402668421 is a deficient number, since it is larger than the sum of its proper divisors (147643995).

402668421 is an equidigital number, since it uses as much as digits as its factorization.

402668421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79932 (or 79891 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 402668421 is about 20066.5996372081. The cubic root of 402668421 is about 738.4410943350.

The spelling of 402668421 in words is "four hundred two million, six hundred sixty-eight thousand, four hundred twenty-one".