40178902987 has 2 divisors, whose sum is σ = 40178902988. Its totient is φ = 40178902986.

The previous prime is 40178902979. The next prime is 40178902991. The reversal of 40178902987 is 78920987104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40178902987 - 2³ = 40178902979 is a prime.

It is a super-2 number, since 2×40178902987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40178902927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20089451493 + 20089451494.

It is an arithmetic number, because the mean of its divisors is an integer number (20089451494).

Almost surely, 2^40178902987 is an apocalyptic number.

40178902987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40178902987 is an equidigital number, since it uses as much as digits as its factorization.

40178902987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 40178902987 in words is "forty billion, one hundred seventy-eight million, nine hundred two thousand, nine hundred eighty-seven".