23784157 has 4 divisors (see below), whose sum is σ = 23801980. Its totient is φ = 23766336.

The previous prime is 23784149. The next prime is 23784217. The reversal of 23784157 is 75148732.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16924996 + 6859161 = 4114^2 + 2619^2 .

It is a cyclic number.

It is not a de Polignac number, because 23784157 - 2³ = 23784149 is a prime.

It is a super-2 number, since 2×23784157² = 1131372248401298, 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 (23787157) 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, 6732 + ... + 9637.

It is an arithmetic number, because the mean of its divisors is an integer number (5950495).

Almost surely, 2^23784157 is an apocalyptic number.

It is an amenable number.

23784157 is a deficient number, since it is larger than the sum of its proper divisors (17823).

23784157 is a wasteful number, since it uses less digits than its factorization.

23784157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17822.

The product of its digits is 47040, while the sum is 37.

The square root of 23784157 is about 4876.9003475568. The cubic root of 23784157 is about 287.5825879935.

The spelling of 23784157 in words is "twenty-three million, seven hundred eighty-four thousand, one hundred fifty-seven".