40000400421987 has 16 divisors (see below), whose sum is σ = 53550047738880. Its totient is φ = 26558959529952.

The previous prime is 40000400421979. The next prime is 40000400422061. The reversal of 40000400421987 is 78912400400004.

It is not a de Polignac number, because 40000400421987 - 2³ = 40000400421979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40000400421187) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13142937 + ... + 15897722.

It is an arithmetic number, because the mean of its divisors is an integer number (3346877983680).

Almost surely, 2^{40000400421987} is an apocalyptic number.

40000400421987 is a deficient number, since it is larger than the sum of its proper divisors (13549647316893).

40000400421987 is a wasteful number, since it uses less digits than its factorization.

40000400421987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29042522.

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 40000400421987 in words is "forty trillion, four hundred million, four hundred twenty-one thousand, nine hundred eighty-seven".