402420431 has 8 divisors (see below), whose sum is σ = 462731904. Its totient is φ = 342814680.

The previous prime is 402420427. The next prime is 402420463. The reversal of 402420431 is 134024204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402420431 - 2² = 402420427 is a prime.

It is a super-2 number, since 2×402420431² = 323884406572451522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402420631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175205 + ... + 177486.

It is an arithmetic number, because the mean of its divisors is an integer number (57841488).

Almost surely, 2^402420431 is an apocalyptic number.

402420431 is a deficient number, since it is larger than the sum of its proper divisors (60311473).

402420431 is a wasteful number, since it uses less digits than its factorization.

402420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352861.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 402420431 is about 20060.4195120640. The cubic root of 402420431 is about 738.2894694877.

Adding to 402420431 its reverse (134024204), we get a palindrome (536444635).

The spelling of 402420431 in words is "four hundred two million, four hundred twenty thousand, four hundred thirty-one".