39426640 has 60 divisors (see below), whose sum is σ = 100782612. Its totient is φ = 14333440.

The previous prime is 39426617. The next prime is 39426659. The reversal of 39426640 is 4662493.

It can be written as a sum of positive squares in 2 ways, for example, as 8690704 + 30735936 = 2948^2 + 5544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39426596 and 39426605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7644 + ... + 11716.

Almost surely, 2^39426640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39426640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50391306).

39426640 is an abundant number, since it is smaller than the sum of its proper divisors (61355972).

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

39426640 is a wasteful number, since it uses less digits than its factorization.

39426640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108 (or 4091 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 39426640 is about 6279.0636244587. The cubic root of 39426640 is about 340.3532660412.

The spelling of 39426640 in words is "thirty-nine million, four hundred twenty-six thousand, six hundred forty".