400023180 has 36 divisors (see below), whose sum is σ = 1213404192. Its totient is φ = 106672800.

The previous prime is 400023161. The next prime is 400023181. The reversal of 400023180 is 81320004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×400023180³ (a number of 27 digits) contains 333 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (400023181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1110996 + ... + 1111355.

It is an arithmetic number, because the mean of its divisors is an integer number (33705672).

Almost surely, 2^400023180 is an apocalyptic number.

It is an amenable number.

400023180 is an abundant number, since it is smaller than the sum of its proper divisors (813381012).

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

400023180 is a wasteful number, since it uses less digits than its factorization.

400023180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222366 (or 2222361 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 400023180 is about 20000.5794916047. The cubic root of 400023180 is about 736.8205320948.

Adding to 400023180 its reverse (81320004), we get a palindrome (481343184).

The spelling of 400023180 in words is "four hundred million, twenty-three thousand, one hundred eighty".