721940025 has 24 divisors (see below), whose sum is σ = 1196976960. Its totient is φ = 383947840.

The previous prime is 721939993. The next prime is 721940033. The reversal of 721940025 is 520049127.

It is not a de Polignac number, because 721940025 - 2⁵ = 721939993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721939974 and 721940001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13519 + ... + 40331.

It is an arithmetic number, because the mean of its divisors is an integer number (49874040).

Almost surely, 2^721940025 is an apocalyptic number.

721940025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721940025 is a deficient number, since it is larger than the sum of its proper divisors (475036935).

721940025 is a wasteful number, since it uses less digits than its factorization.

721940025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27185 (or 27180 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 721940025 is about 26868.9416427220. The cubic root of 721940025 is about 897.0852308186.

The spelling of 721940025 in words is "seven hundred twenty-one million, nine hundred forty thousand, twenty-five".