725121947 has 16 divisors (see below), whose sum is σ = 842728320. Its totient is φ = 616968000.

The previous prime is 725121923. The next prime is 725121959. The reversal of 725121947 is 749121527.

It is a happy number.

It is not a de Polignac number, because 725121947 - 2¹⁰ = 725120923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 725121947.

It is not an unprimeable number, because it can be changed into a prime (725121547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3554 + ... + 38247.

It is an arithmetic number, because the mean of its divisors is an integer number (52670520).

Almost surely, 2^725121947 is an apocalyptic number.

725121947 is a deficient number, since it is larger than the sum of its proper divisors (117606373).

725121947 is a wasteful number, since it uses less digits than its factorization.

725121947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41914.

The product of its digits is 35280, while the sum is 38.

The square root of 725121947 is about 26928.0884393973. The cubic root of 725121947 is about 898.4012551137.

The spelling of 725121947 in words is "seven hundred twenty-five million, one hundred twenty-one thousand, nine hundred forty-seven".