823403139 has 16 divisors (see below), whose sum is σ = 1189585152. Its totient is φ = 503597088.

The previous prime is 823403137. The next prime is 823403149. The reversal of 823403139 is 931304328.

It is a happy number.

It is not a de Polignac number, because 823403139 - 2¹ = 823403137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (823403137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58407 + ... + 71120.

It is an arithmetic number, because the mean of its divisors is an integer number (74349072).

Almost surely, 2^823403139 is an apocalyptic number.

823403139 is a deficient number, since it is larger than the sum of its proper divisors (366182013).

823403139 is a wasteful number, since it uses less digits than its factorization.

823403139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129706.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 823403139 is about 28695.0019864087. The cubic root of 823403139 is about 937.2832144437.

The spelling of 823403139 in words is "eight hundred twenty-three million, four hundred three thousand, one hundred thirty-nine".