400342431 has 4 divisors (see below), whose sum is σ = 533789912. Its totient is φ = 266894952.

The previous prime is 400342399. The next prime is 400342433. The reversal of 400342431 is 134243004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400342431 - 2⁵ = 400342399 is a prime.

It is a super-2 number, since 2×400342431² = 320548124117979522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400342398 and 400342407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400342433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66723736 + ... + 66723741.

It is an arithmetic number, because the mean of its divisors is an integer number (133447478).

Almost surely, 2^400342431 is an apocalyptic number.

400342431 is a deficient number, since it is larger than the sum of its proper divisors (133447481).

400342431 is a wasteful number, since it uses less digits than its factorization.

400342431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133447480.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 400342431 is about 20008.5589436121. The cubic root of 400342431 is about 737.0164941903.

Adding to 400342431 its reverse (134243004), we get a palindrome (534585435).

The spelling of 400342431 in words is "four hundred million, three hundred forty-two thousand, four hundred thirty-one".