40440251640 has 64 divisors (see below), whose sum is σ = 122022093600. Its totient is φ = 10721725952.

The previous prime is 40440251633. The next prime is 40440251773. The reversal of 40440251640 is 4615204404.

It is a happy number.

40440251640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40440251598 and 40440251607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953235 + ... + 994754.

Almost surely, 2^40440251640 is an apocalyptic number.

40440251640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40440251640 is an abundant number, since it is smaller than the sum of its proper divisors (81581841960).

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

40440251640 is a wasteful number, since it uses less digits than its factorization.

40440251640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948176 (or 1948172 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 40440251640 in words is "forty billion, four hundred forty million, two hundred fifty-one thousand, six hundred forty".