40913721 has 16 divisors (see below), whose sum is σ = 61758720. Its totient is φ = 26760240.

The previous prime is 40913701. The next prime is 40913779. The reversal of 40913721 is 12731904.

It is not a de Polignac number, because 40913721 - 2¹⁵ = 40880953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (40913701) 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, 12865 + ... + 15726.

It is an arithmetic number, because the mean of its divisors is an integer number (3859920).

Almost surely, 2^40913721 is an apocalyptic number.

It is an amenable number.

40913721 is a deficient number, since it is larger than the sum of its proper divisors (20844999).

40913721 is a wasteful number, since it uses less digits than its factorization.

40913721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28653 (or 28647 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 40913721 is about 6396.3834312836. The cubic root of 40913721 is about 344.5796771532.

The spelling of 40913721 in words is "forty million, nine hundred thirteen thousand, seven hundred twenty-one".