726640149 has 4 divisors (see below), whose sum is σ = 968853536. Its totient is φ = 484426764.

The previous prime is 726640147. The next prime is 726640169. The reversal of 726640149 is 941046627.

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 not a de Polignac number, because 726640149 - 2¹ = 726640147 is a prime.

It is a super-2 number, since 2×726640149² = 1056011812277484402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726640147) 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, 121106689 + ... + 121106694.

It is an arithmetic number, because the mean of its divisors is an integer number (242213384).

Almost surely, 2^726640149 is an apocalyptic number.

It is an amenable number.

726640149 is a deficient number, since it is larger than the sum of its proper divisors (242213387).

726640149 is a wasteful number, since it uses less digits than its factorization.

726640149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242213386.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 726640149 is about 26956.2636320392. The cubic root of 726640149 is about 899.0278181265.

The spelling of 726640149 in words is "seven hundred twenty-six million, six hundred forty thousand, one hundred forty-nine".