400142232 has 144 divisors (see below), whose sum is σ = 1304456400. Its totient is φ = 110355840.

The previous prime is 400142227. The next prime is 400142233. The reversal of 400142232 is 232241004.

It is a super-2 number, since 2×400142232² = 320227611659883648, 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 not an unprimeable number, because it can be changed into a prime (400142233) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 100357 + ... + 104267.

It is an arithmetic number, because the mean of its divisors is an integer number (9058725).

Almost surely, 2^400142232 is an apocalyptic number.

400142232 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400142232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652228200).

400142232 is an abundant number, since it is smaller than the sum of its proper divisors (904314168).

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

400142232 is a wasteful number, since it uses less digits than its factorization.

400142232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966 (or 3952 counting only the distinct ones).

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

The square root of 400142232 is about 20003.5554839633. Note that the first 3 decimals coincide. The cubic root of 400142232 is about 736.8936205737.

Adding to 400142232 its reverse (232241004), we get a palindrome (632383236).

The spelling of 400142232 in words is "four hundred million, one hundred forty-two thousand, two hundred thirty-two".