725765421 has 8 divisors (see below), whose sum is σ = 970477344. Its totient is φ = 482448560.

The previous prime is 725765413. The next prime is 725765449. The reversal of 725765421 is 124567527.

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 725765421 - 2³ = 725765413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 725765421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725765221) 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, 347550 + ... + 349631.

It is an arithmetic number, because the mean of its divisors is an integer number (121309668).

Almost surely, 2^725765421 is an apocalyptic number.

It is an amenable number.

725765421 is a deficient number, since it is larger than the sum of its proper divisors (244711923).

725765421 is a wasteful number, since it uses less digits than its factorization.

725765421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697531.

The product of its digits is 117600, while the sum is 39.

The square root of 725765421 is about 26940.0337973062. The cubic root of 725765421 is about 898.6669239594. Note that the first 3 decimals are identical.

The spelling of 725765421 in words is "seven hundred twenty-five million, seven hundred sixty-five thousand, four hundred twenty-one".