40001999988 has 24 divisors (see below), whose sum is σ = 93342834592. Its totient is φ = 13333309344.

The previous prime is 40001999987. The next prime is 40002000029. The reversal of 40001999988 is 88999910004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40001999987) 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, 190506 + ... + 341022.

Almost surely, 2^40001999988 is an apocalyptic number.

It is an amenable number.

40001999988 is an abundant number, since it is smaller than the sum of its proper divisors (53340834604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40001999988 is a wasteful number, since it uses less digits than its factorization.

40001999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172671 (or 172669 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 57.

The spelling of 40001999988 in words is "forty billion, one million, nine hundred ninety-nine thousand, nine hundred eighty-eight".