400432431 has 8 divisors (see below), whose sum is σ = 610182784. Its totient is φ = 228818520.

The previous prime is 400432423. The next prime is 400432447. The reversal of 400432431 is 134234004.

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

It is not a de Polignac number, because 400432431 - 2³ = 400432423 is a prime.

It is a super-2 number, since 2×400432431² = 320692263593139522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 19068211 = 400432431 / (4 + 0 + 0 + 4 + 3 + 2 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400432398 and 400432407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400432631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9534085 + ... + 9534126.

It is an arithmetic number, because the mean of its divisors is an integer number (76272848).

Almost surely, 2^400432431 is an apocalyptic number.

400432431 is a deficient number, since it is larger than the sum of its proper divisors (209750353).

400432431 is a wasteful number, since it uses less digits than its factorization.

400432431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19068221.

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

The square root of 400432431 is about 20010.8078547569. The cubic root of 400432431 is about 737.0717190089.

Adding to 400432431 its reverse (134234004), we get a palindrome (534666435).

The spelling of 400432431 in words is "four hundred million, four hundred thirty-two thousand, four hundred thirty-one".