421339957 has 2 divisors, whose sum is σ = 421339958. Its totient is φ = 421339956.

The previous prime is 421339949. The next prime is 421339969. The reversal of 421339957 is 759933124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417752721 + 3587236 = 20439^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 421339957 - 2³ = 421339949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421339907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210669978 + 210669979.

It is an arithmetic number, because the mean of its divisors is an integer number (210669979).

Almost surely, 2^421339957 is an apocalyptic number.

It is an amenable number.

421339957 is a deficient number, since it is larger than the sum of its proper divisors (1).

421339957 is an equidigital number, since it uses as much as digits as its factorization.

421339957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 421339957 is about 20526.5671021727. The cubic root of 421339957 is about 749.6828033488.

The spelling of 421339957 in words is "four hundred twenty-one million, three hundred thirty-nine thousand, nine hundred fifty-seven".