400042332 has 18 divisors (see below), whose sum is σ = 1011218208. Its totient is φ = 133347432.

The previous prime is 400042319. The next prime is 400042339. The reversal of 400042332 is 233240004.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400042339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5556108 + ... + 5556179.

Almost surely, 2^400042332 is an apocalyptic number.

It is an amenable number.

400042332 is an abundant number, since it is smaller than the sum of its proper divisors (611175876).

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

400042332 is a wasteful number, since it uses less digits than its factorization.

400042332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11112297 (or 11112292 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 400042332 is about 20001.0582720015. The cubic root of 400042332 is about 736.8322908815.

Adding to 400042332 its reverse (233240004), we get a palindrome (633282336).

The spelling of 400042332 in words is "four hundred million, forty-two thousand, three hundred thirty-two".