9723157 has 4 divisors (see below), whose sum is σ = 9747340. Its totient is φ = 9698976.

The previous prime is 9723137. The next prime is 9723179. The reversal of 9723157 is 7513279.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7513279 = 47 ⋅159857.

It can be written as a sum of positive squares in 2 ways, for example, as 5885476 + 3837681 = 2426^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 9723157 - 2⁷ = 9723029 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9723137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11478 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (2436835).

Almost surely, 2^9723157 is an apocalyptic number.

It is an amenable number.

9723157 is a deficient number, since it is larger than the sum of its proper divisors (24183).

9723157 is a wasteful number, since it uses less digits than its factorization.

9723157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24182.

The product of its digits is 13230, while the sum is 34.

The square root of 9723157 is about 3118.1977166306. The cubic root of 9723157 is about 213.4367009374.

It can be divided in two parts, 972315 and 7, that multiplied together give a triangular number (6806205 = T₃₆₈₉).

The spelling of 9723157 in words is "nine million, seven hundred twenty-three thousand, one hundred fifty-seven".