400431 has 8 divisors (see below), whose sum is σ = 538624. Its totient is φ = 264600.

The previous prime is 400429. The next prime is 400441. The reversal of 400431 is 134004.

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

It is not a de Polignac number, because 400431 - 2¹ = 400429 is a prime.

It is a super-2 number, since 2×400431² = 320689971522, 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 (400441) 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, 145 + ... + 906.

It is an arithmetic number, because the mean of its divisors is an integer number (67328).

2⁴⁰⁰⁴³¹ is an apocalyptic number.

400431 is a deficient number, since it is larger than the sum of its proper divisors (138193).

400431 is a wasteful number, since it uses less digits than its factorization.

400431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 400431 is about 632.7961757154. The cubic root of 400431 is about 73.7070840999.

Adding to 400431 its reverse (134004), we get a palindrome (534435).

The spelling of 400431 in words is "four hundred thousand, four hundred thirty-one".