400154540644 has 12 divisors (see below), whose sum is σ = 724417703100. Its totient is φ = 193178054048.

The previous prime is 400154540581. The next prime is 400154540759. The reversal of 400154540644 is 446045451004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 233781920100 + 166372620544 = 483510^2 + 407888^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1724803939 + ... + 1724804170.

It is an arithmetic number, because the mean of its divisors is an integer number (60368141925).

Almost surely, 2^400154540644 is an apocalyptic number.

It is an amenable number.

400154540644 is a deficient number, since it is larger than the sum of its proper divisors (324263162456).

400154540644 is a wasteful number, since it uses less digits than its factorization.

400154540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449608142 (or 3449608140 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 37.

Adding to 400154540644 its reverse (446045451004), we get a palindrome (846199991648).

The spelling of 400154540644 in words is "four hundred billion, one hundred fifty-four million, five hundred forty thousand, six hundred forty-four".