400144020 has 24 divisors (see below), whose sum is σ = 1120403424. Its totient is φ = 106705056.

The previous prime is 400143929. The next prime is 400144049. The reversal of 400144020 is 20441004.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3334474 + ... + 3334593.

It is an arithmetic number, because the mean of its divisors is an integer number (46683476).

Almost surely, 2^400144020 is an apocalyptic number.

It is an amenable number.

400144020 is an abundant number, since it is smaller than the sum of its proper divisors (720259404).

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

400144020 is a wasteful number, since it uses less digits than its factorization.

400144020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6669079 (or 6669077 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400144020 is about 20003.6001759683. The cubic root of 400144020 is about 736.8947181533.

Adding to 400144020 its reverse (20441004), we get a palindrome (420585024).

The spelling of 400144020 in words is "four hundred million, one hundred forty-four thousand, twenty".