6402431 has 8 divisors (see below), whose sum is σ = 7332864. Its totient is φ = 5475960.

The previous prime is 6402413. The next prime is 6402433. The reversal of 6402431 is 1342046.

It is a happy number.

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

It is not a de Polignac number, because 6402431 - 2²² = 2208127 is a prime.

It is a super-3 number, since 3×6402431³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6402433) 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, 4586 + ... + 5816.

It is an arithmetic number, because the mean of its divisors is an integer number (916608).

Almost surely, 2^6402431 is an apocalyptic number.

6402431 is a deficient number, since it is larger than the sum of its proper divisors (930433).

6402431 is a wasteful number, since it uses less digits than its factorization.

6402431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6402431 is about 2530.3025510796. The cubic root of 6402431 is about 185.6870580822.

Adding to 6402431 its reverse (1342046), we get a palindrome (7744477).

The spelling of 6402431 in words is "six million, four hundred two thousand, four hundred thirty-one".