402458021 has 10 divisors (see below), whose sum is σ = 469509222. Its totient is φ = 344961960.

The previous prime is 402457997. The next prime is 402458029. The reversal of 402458021 is 120854204.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 201924100 + 200533921 = 14210^2 + 14161^2 .

It is not a de Polignac number, because 402458021 - 2²² = 398263717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402458029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 81410 + ... + 86211.

Almost surely, 2^402458021 is an apocalyptic number.

It is an amenable number.

402458021 is a deficient number, since it is larger than the sum of its proper divisors (67051201).

402458021 is an frugal number, since it uses more digits than its factorization.

402458021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167649 (or 167628 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 402458021 is about 20061.3564097745. The cubic root of 402458021 is about 738.3124565885.

The spelling of 402458021 in words is "four hundred two million, four hundred fifty-eight thousand, twenty-one".