721402025 has 12 divisors (see below), whose sum is σ = 902902032. Its totient is φ = 571725840.

The previous prime is 721402007. The next prime is 721402079. The reversal of 721402025 is 520204127.

It is a happy number.

It is not a de Polignac number, because 721402025 - 2²² = 717207721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132167 + ... + 137516.

It is an arithmetic number, because the mean of its divisors is an integer number (75241836).

Almost surely, 2^721402025 is an apocalyptic number.

It is an amenable number.

721402025 is a deficient number, since it is larger than the sum of its proper divisors (181500007).

721402025 is a wasteful number, since it uses less digits than its factorization.

721402025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269800 (or 269795 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 721402025 is about 26858.9282176337. The cubic root of 721402025 is about 896.8623352062.

The spelling of 721402025 in words is "seven hundred twenty-one million, four hundred two thousand, twenty-five".