400144436 has 36 divisors (see below), whose sum is σ = 768002508. Its totient is φ = 181784064.

The previous prime is 400144403. The next prime is 400144439. The reversal of 400144436 is 634441004.

It can be written as a sum of positive squares in 6 ways, for example, as 2540836 + 397603600 = 1594^2 + 19940^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400144439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53690 + ... + 60686.

It is an arithmetic number, because the mean of its divisors is an integer number (21333403).

Almost surely, 2^400144436 is an apocalyptic number.

It is an amenable number.

400144436 is a deficient number, since it is larger than the sum of its proper divisors (367858072).

400144436 is a wasteful number, since it uses less digits than its factorization.

400144436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076 (or 7045 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 400144436 is about 20003.6105740939. The cubic root of 400144436 is about 736.8949735181.

The spelling of 400144436 in words is "four hundred million, one hundred forty-four thousand, four hundred thirty-six".