721855425 has 24 divisors (see below), whose sum is σ = 1196950176. Its totient is φ = 383866240.

The previous prime is 721855417. The next prime is 721855439. The reversal of 721855425 is 524558127.

It is not a de Polignac number, because 721855425 - 2³ = 721855417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12157 + ... + 39893.

It is an arithmetic number, because the mean of its divisors is an integer number (49872924).

Almost surely, 2^721855425 is an apocalyptic number.

721855425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721855425 is a deficient number, since it is larger than the sum of its proper divisors (475094751).

721855425 is a wasteful number, since it uses less digits than its factorization.

721855425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28097 (or 28092 counting only the distinct ones).

The product of its digits is 112000, while the sum is 39.

The square root of 721855425 is about 26867.3672882179. The cubic root of 721855425 is about 897.0501880299.

The spelling of 721855425 in words is "seven hundred twenty-one million, eight hundred fifty-five thousand, four hundred twenty-five".