657323949 has 4 divisors (see below), whose sum is σ = 876431936. Its totient is φ = 438215964.

The previous prime is 657323939. The next prime is 657323957. The reversal of 657323949 is 949323756.

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 657323949 - 2¹⁵ = 657291181 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657323898 and 657323907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657323939) 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, 109553989 + ... + 109553994.

It is an arithmetic number, because the mean of its divisors is an integer number (219107984).

Almost surely, 2^657323949 is an apocalyptic number.

It is an amenable number.

657323949 is a deficient number, since it is larger than the sum of its proper divisors (219107987).

657323949 is a wasteful number, since it uses less digits than its factorization.

657323949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219107986.

The product of its digits is 1224720, while the sum is 48.

The square root of 657323949 is about 25638.3296842833. The cubic root of 657323949 is about 869.4804441808.

The spelling of 657323949 in words is "six hundred fifty-seven million, three hundred twenty-three thousand, nine hundred forty-nine".