40423786644 has 48 divisors (see below), whose sum is σ = 95965309440. Its totient is φ = 13241860320.

The previous prime is 40423786621. The next prime is 40423786679. The reversal of 40423786644 is 44668732404.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 40423786593 and 40423786602.

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, 37087 + ... + 286745.

It is an arithmetic number, because the mean of its divisors is an integer number (1999277280).

Almost surely, 2^40423786644 is an apocalyptic number.

It is an amenable number.

40423786644 is an abundant number, since it is smaller than the sum of its proper divisors (55541522796).

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

40423786644 is a wasteful number, since it uses less digits than its factorization.

40423786644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249900 (or 249898 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 48.

The spelling of 40423786644 in words is "forty billion, four hundred twenty-three million, seven hundred eighty-six thousand, six hundred forty-four".