823238149 has 4 divisors (see below), whose sum is σ = 859031136. Its totient is φ = 787445164.

The previous prime is 823238131. The next prime is 823238153. The reversal of 823238149 is 941832328.

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 not a de Polignac number, because 823238149 - 2⁷ = 823238021 is a prime.

It is a super-3 number, since 3×823238149³ (a number of 28 digits) contains 333 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 (823238159) 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, 17896459 + ... + 17896504.

It is an arithmetic number, because the mean of its divisors is an integer number (214757784).

Almost surely, 2^823238149 is an apocalyptic number.

It is an amenable number.

823238149 is a deficient number, since it is larger than the sum of its proper divisors (35792987).

823238149 is a wasteful number, since it uses less digits than its factorization.

823238149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35792986.

The product of its digits is 82944, while the sum is 40.

The square root of 823238149 is about 28692.1269514827. The cubic root of 823238149 is about 937.2206073277.

The spelling of 823238149 in words is "eight hundred twenty-three million, two hundred thirty-eight thousand, one hundred forty-nine".