400024999988 has 6 divisors (see below), whose sum is σ = 700043749986. Its totient is φ = 200012499992.

The previous prime is 400024999987. The next prime is 400025000003. The reversal of 400024999988 is 889999420004.

It can be written as a sum of positive squares in only one way, i.e., 261691587364 + 138333412624 = 511558^2 + 371932^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400024999988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400024999987) by changing a digit.

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 as a sum of consecutive naturals, namely, 50003124995 + ... + 50003125002.

It is an arithmetic number, because the mean of its divisors is an integer number (116673958331).

Almost surely, 2^400024999988 is an apocalyptic number.

It is an amenable number.

400024999988 is a deficient number, since it is larger than the sum of its proper divisors (300018749998).

400024999988 is a wasteful number, since it uses less digits than its factorization.

400024999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100006250001 (or 100006249999 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 62.

The spelling of 400024999988 in words is "four hundred billion, twenty-four million, nine hundred ninety-nine thousand, nine hundred eighty-eight".