400124431 has 4 divisors (see below), whose sum is σ = 457285072. Its totient is φ = 342963792.

The previous prime is 400124419. The next prime is 400124443. The reversal of 400124431 is 134421004.

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

It is an interprime number because it is at equal distance from previous prime (400124419) and next prime (400124443).

It is a cyclic number.

It is not a de Polignac number, because 400124431 - 2⁷ = 400124303 is a prime.

It is a super-2 number, since 2×400124431² = 320199120566147522, 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 = 400124399 and 400124408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400124411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28580310 + ... + 28580323.

It is an arithmetic number, because the mean of its divisors is an integer number (114321268).

Almost surely, 2^400124431 is an apocalyptic number.

400124431 is a deficient number, since it is larger than the sum of its proper divisors (57160641).

400124431 is an equidigital number, since it uses as much as digits as its factorization.

400124431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57160640.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 400124431 is about 20003.1105331146. The cubic root of 400124431 is about 736.8826930944.

Adding to 400124431 its reverse (134421004), we get a palindrome (534545435).

The spelling of 400124431 in words is "four hundred million, one hundred twenty-four thousand, four hundred thirty-one".