40425721 has 8 divisors (see below), whose sum is σ = 46834304. Its totient is φ = 34175520.

The previous prime is 40425703. The next prime is 40425727. The reversal of 40425721 is 12752404.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40425721 - 2⁵ = 40425689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40425727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39045 + ... + 40066.

It is an arithmetic number, because the mean of its divisors is an integer number (5854288).

Almost surely, 2^40425721 is an apocalyptic number.

It is an amenable number.

40425721 is a deficient number, since it is larger than the sum of its proper divisors (6408583).

40425721 is an equidigital number, since it uses as much as digits as its factorization.

40425721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79191.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 40425721 is about 6358.1224429858. The cubic root of 40425721 is about 343.2041980395.

The spelling of 40425721 in words is "forty million, four hundred twenty-five thousand, seven hundred twenty-one".