400431001 has 4 divisors (see below), whose sum is σ = 400546404. Its totient is φ = 400315600.

The previous prime is 400430941. The next prime is 400431049. The reversal of 400431001 is 100134004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 301925376 + 98505625 = 17376^2 + 9925^2 .

It is a cyclic number.

It is not a de Polignac number, because 400431001 - 2⁹ = 400430489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400431071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52330 + ... + 59491.

It is an arithmetic number, because the mean of its divisors is an integer number (100136601).

Almost surely, 2^400431001 is an apocalyptic number.

It is an amenable number.

400431001 is a deficient number, since it is larger than the sum of its proper divisors (115403).

400431001 is a wasteful number, since it uses less digits than its factorization.

400431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115402.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400431001 is about 20010.7721240336. The cubic root of 400431001 is about 737.0708416126.

Adding to 400431001 its reverse (100134004), we get a palindrome (500565005).

The spelling of 400431001 in words is "four hundred million, four hundred thirty-one thousand, one".