725186138 has 4 divisors (see below), whose sum is σ = 1087779210. Its totient is φ = 362593068.

The previous prime is 725186123. The next prime is 725186183. The reversal of 725186138 is 831681527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 716793529 + 8392609 = 26773^2 + 2897^2 .

It is a junction number, because it is equal to n+sod(n) for n = 725186095 and 725186104.

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 as a sum of consecutive naturals, namely, 181296533 + ... + 181296536.

Almost surely, 2^725186138 is an apocalyptic number.

725186138 is a deficient number, since it is larger than the sum of its proper divisors (362593072).

725186138 is a wasteful number, since it uses less digits than its factorization.

725186138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362593071.

The product of its digits is 80640, while the sum is 41.

The square root of 725186138 is about 26929.2803097298. The cubic root of 725186138 is about 898.4277644816.

The spelling of 725186138 in words is "seven hundred twenty-five million, one hundred eighty-six thousand, one hundred thirty-eight".