191977852 has 24 divisors (see below), whose sum is σ = 367984512. Its totient is φ = 86910000.

The previous prime is 191977817. The next prime is 191977853. The reversal of 191977852 is 258779191.

It is a junction number, because it is equal to n+sod(n) for n = 191977796 and 191977805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191977853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2353 + ... + 19735.

It is an arithmetic number, because the mean of its divisors is an integer number (15332688).

Almost surely, 2^191977852 is an apocalyptic number.

It is an amenable number.

191977852 is a deficient number, since it is larger than the sum of its proper divisors (176006660).

191977852 is a wasteful number, since it uses less digits than its factorization.

191977852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17649 (or 17647 counting only the distinct ones).

The product of its digits is 317520, while the sum is 49.

The square root of 191977852 is about 13855.6072403919. The cubic root of 191977852 is about 576.8776446703.

The spelling of 191977852 in words is "one hundred ninety-one million, nine hundred seventy-seven thousand, eight hundred fifty-two".