40928639 has 4 divisors (see below), whose sum is σ = 43336224. Its totient is φ = 38521056.

The previous prime is 40928633. The next prime is 40928651. The reversal of 40928639 is 93682904.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40928639 - 2⁸ = 40928383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40928596 and 40928605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40928633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1203767 + ... + 1203800.

It is an arithmetic number, because the mean of its divisors is an integer number (10834056).

Almost surely, 2^40928639 is an apocalyptic number.

40928639 is a deficient number, since it is larger than the sum of its proper divisors (2407585).

40928639 is a wasteful number, since it uses less digits than its factorization.

40928639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407584.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 40928639 is about 6397.5494527202. The cubic root of 40928639 is about 344.6215523876.

The spelling of 40928639 in words is "forty million, nine hundred twenty-eight thousand, six hundred thirty-nine".