400042344 has 32 divisors (see below), whose sum is σ = 1077037920. Its totient is φ = 123089856.

The previous prime is 400042339. The next prime is 400042369. The reversal of 400042344 is 443240004.

It is a self number, because there is not a number n which added to its sum of digits gives 400042344.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640782 + ... + 641405.

It is an arithmetic number, because the mean of its divisors is an integer number (33657435).

Almost surely, 2^400042344 is an apocalyptic number.

It is an amenable number.

400042344 is an abundant number, since it is smaller than the sum of its proper divisors (676995576).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400042344 is a wasteful number, since it uses less digits than its factorization.

400042344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282209 (or 1282205 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 400042344 is about 20001.0585719856. The cubic root of 400042344 is about 736.8322982490.

Adding to 400042344 its reverse (443240004), we get a palindrome (843282348).

The spelling of 400042344 in words is "four hundred million, forty-two thousand, three hundred forty-four".