197757990 has 64 divisors (see below), whose sum is σ = 544389120. Its totient is φ = 51032160.

The previous prime is 197757977. The next prime is 197758019. The reversal of 197757990 is 99757791.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3444 + ... + 20183.

It is an arithmetic number, because the mean of its divisors is an integer number (8506080).

Almost surely, 2^197757990 is an apocalyptic number.

197757990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197757990 is an abundant number, since it is smaller than the sum of its proper divisors (346631130).

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

197757990 is a wasteful number, since it uses less digits than its factorization.

197757990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23674 (or 23668 counting only the distinct ones).

The product of its (nonzero) digits is 1250235, while the sum is 54.

The square root of 197757990 is about 14062.6451992504. The cubic root of 197757990 is about 582.6101052402.

The spelling of 197757990 in words is "one hundred ninety-seven million, seven hundred fifty-seven thousand, nine hundred ninety".