400024999987 has 2 divisors, whose sum is σ = 400024999988. Its totient is φ = 400024999986.

The previous prime is 400024999961. The next prime is 400025000003. The reversal of 400024999987 is 789999420004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400024999987 is a prime.

It is a super-2 number, since 2×400024999987² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400024979987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200012499993 + 200012499994.

It is an arithmetic number, because the mean of its divisors is an integer number (200012499994).

Almost surely, 2^400024999987 is an apocalyptic number.

400024999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

400024999987 is an equidigital number, since it uses as much as digits as its factorization.

400024999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 400024999987 in words is "four hundred billion, twenty-four million, nine hundred ninety-nine thousand, nine hundred eighty-seven".