400444431 has 8 divisors (see below), whose sum is σ = 534201264. Its totient is φ = 266825280.

The previous prime is 400444411. The next prime is 400444433. The reversal of 400444431 is 134444004.

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

It is a de Polignac number, because none of the positive numbers 2^k-400444431 is a prime.

It is a super-2 number, since 2×400444431² = 320711484637827522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444433) 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 7 ways as a sum of consecutive naturals, for example, 27430 + ... + 39411.

It is an arithmetic number, because the mean of its divisors is an integer number (66775158).

Almost surely, 2^400444431 is an apocalyptic number.

400444431 is a deficient number, since it is larger than the sum of its proper divisors (133756833).

400444431 is a wasteful number, since it uses less digits than its factorization.

400444431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68841.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 400444431 is about 20011.1076904803. The cubic root of 400444431 is about 737.0790816929.

Adding to 400444431 its reverse (134444004), we get a palindrome (534888435).

The spelling of 400444431 in words is "four hundred million, four hundred forty-four thousand, four hundred thirty-one".