726198157 has 4 divisors (see below), whose sum is σ = 749623936. Its totient is φ = 702772380.

The previous prime is 726198139. The next prime is 726198169. The reversal of 726198157 is 751891627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726198157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726198127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11712843 + ... + 11712904.

It is an arithmetic number, because the mean of its divisors is an integer number (187405984).

Almost surely, 2^726198157 is an apocalyptic number.

It is an amenable number.

726198157 is a deficient number, since it is larger than the sum of its proper divisors (23425779).

726198157 is a wasteful number, since it uses less digits than its factorization.

726198157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23425778.

The product of its digits is 211680, while the sum is 46.

The square root of 726198157 is about 26948.0640677582. The cubic root of 726198157 is about 898.8454978501.

The spelling of 726198157 in words is "seven hundred twenty-six million, one hundred ninety-eight thousand, one hundred fifty-seven".