400040399987 has 8 divisors (see below), whose sum is σ = 417615245856. Its totient is φ = 382480702912.

The previous prime is 400040399981. The next prime is 400040400047. The reversal of 400040399987 is 789993040004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400040399987 - 2¹⁶ = 400040334451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400040399981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3733208 + ... + 3838869.

It is an arithmetic number, because the mean of its divisors is an integer number (52201905732).

Almost surely, 2^400040399987 is an apocalyptic number.

400040399987 is a deficient number, since it is larger than the sum of its proper divisors (17574845869).

400040399987 is a wasteful number, since it uses less digits than its factorization.

400040399987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7574397.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 400040399987 in words is "four hundred billion, forty million, three hundred ninety-nine thousand, nine hundred eighty-seven".