402442401 has 16 divisors (see below), whose sum is σ = 573267200. Its totient is φ = 250378128.

The previous prime is 402442393. The next prime is 402442421. The reversal of 402442401 is 104244204.

It is not a de Polignac number, because 402442401 - 2³ = 402442393 is a prime.

It is a super-2 number, since 2×402442401² = 323919772245289602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402442421) 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, 48871 + ... + 56508.

It is an arithmetic number, because the mean of its divisors is an integer number (35829200).

Almost surely, 2^402442401 is an apocalyptic number.

It is an amenable number.

402442401 is a deficient number, since it is larger than the sum of its proper divisors (170824799).

402442401 is a wasteful number, since it uses less digits than its factorization.

402442401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105468.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 402442401 is about 20060.9671003170. The cubic root of 402442401 is about 738.3029047933.

Adding to 402442401 its reverse (104244204), we get a palindrome (506686605).

The spelling of 402442401 in words is "four hundred two million, four hundred forty-two thousand, four hundred one".