400344430 has 24 divisors (see below), whose sum is σ = 732322872. Its totient is φ = 157543584.

The previous prime is 400344409. The next prime is 400344431. The reversal of 400344430 is 34443004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400344431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517524 + ... + 518296.

It is an arithmetic number, because the mean of its divisors is an integer number (30513453).

Almost surely, 2^400344430 is an apocalyptic number.

400344430 is a deficient number, since it is larger than the sum of its proper divisors (331978442).

400344430 is an frugal number, since it uses more digits than its factorization.

400344430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620 (or 847 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 400344430 is about 20008.6088971722. The cubic root of 400344430 is about 737.0177208847.

Adding to 400344430 its reverse (34443004), we get a palindrome (434787434).

The spelling of 400344430 in words is "four hundred million, three hundred forty-four thousand, four hundred thirty".