400339231 has 2 divisors, whose sum is σ = 400339232. Its totient is φ = 400339230.

The previous prime is 400339213. The next prime is 400339237. The reversal of 400339231 is 132933004.

It is a happy number.

Together with previous prime (400339213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400339231 - 2¹³ = 400331039 is a prime.

It is a super-2 number, since 2×400339231² = 320542999755342722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400339196 and 400339205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400339237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200169615 + 200169616.

It is an arithmetic number, because the mean of its divisors is an integer number (200169616).

Almost surely, 2^400339231 is an apocalyptic number.

400339231 is a deficient number, since it is larger than the sum of its proper divisors (1).

400339231 is an equidigital number, since it uses as much as digits as its factorization.

400339231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 400339231 is about 20008.4789776734. The cubic root of 400339231 is about 737.0145304888.

It can be divided in two parts, 4003 and 39231, that added together give a palindrome (43234).

The spelling of 400339231 in words is "four hundred million, three hundred thirty-nine thousand, two hundred thirty-one".