40391689000 has 64 divisors (see below), whose sum is σ = 101787089040. Its totient is φ = 14913849600.

The previous prime is 40391688991. The next prime is 40391689001. The reversal of 40391689000 is 98619304.

It can be written as a sum of positive squares in 8 ways, for example, as 5282673124 + 35109015876 = 72682^2 + 187374^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (40391689001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540527 + ... + 1566526.

Almost surely, 2^40391689000 is an apocalyptic number.

40391689000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40391689000 is an abundant number, since it is smaller than the sum of its proper divisors (61395400040).

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

40391689000 is a wasteful number, since it uses less digits than its factorization.

40391689000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107087 (or 3107073 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The spelling of 40391689000 in words is "forty billion, three hundred ninety-one million, six hundred eighty-nine thousand".