823981530 has 32 divisors (see below), whose sum is σ = 1990162944. Its totient is φ = 218327616.

The previous prime is 823981471. The next prime is 823981541. The reversal of 823981530 is 35189328.

It is a super-2 number, since 2×823981530² = 1357891123562281800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82762 + ... + 92181.

It is an arithmetic number, because the mean of its divisors is an integer number (62192592).

Almost surely, 2^823981530 is an apocalyptic number.

823981530 is an abundant number, since it is smaller than the sum of its proper divisors (1166181414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

823981530 is a wasteful number, since it uses less digits than its factorization.

823981530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175110.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 823981530 is about 28705.0784705425. The cubic root of 823981530 is about 937.5026247038.

The spelling of 823981530 in words is "eight hundred twenty-three million, nine hundred eighty-one thousand, five hundred thirty".