400142304 has 36 divisors (see below), whose sum is σ = 1137905496. Its totient is φ = 133380672.

The previous prime is 400142257. The next prime is 400142333. The reversal of 400142304 is 403241004.

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

It is a super-2 number, since 2×400142304² = 320227726900856832, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 694404 + ... + 694979.

It is an arithmetic number, because the mean of its divisors is an integer number (31608486).

Almost surely, 2^400142304 is an apocalyptic number.

It is an amenable number.

400142304 is an abundant number, since it is smaller than the sum of its proper divisors (737763192).

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

400142304 is a wasteful number, since it uses less digits than its factorization.

400142304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389399 (or 1389388 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400142304 is about 20003.5572836433. The cubic root of 400142304 is about 736.8936647716.

Adding to 400142304 its reverse (403241004), we get a palindrome (803383308).

The spelling of 400142304 in words is "four hundred million, one hundred forty-two thousand, three hundred four".