197931870 has 64 divisors (see below), whose sum is σ = 542111040. Its totient is φ = 51352704.

The previous prime is 197931841. The next prime is 197931871. The reversal of 197931870 is 78139791.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197931871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84 + ... + 19896.

It is an arithmetic number, because the mean of its divisors is an integer number (8470485).

Almost surely, 2^197931870 is an apocalyptic number.

197931870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197931870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271055520).

197931870 is an abundant number, since it is smaller than the sum of its proper divisors (344179170).

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

197931870 is a wasteful number, since it uses less digits than its factorization.

197931870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19866 (or 19860 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 197931870 is about 14068.8261770483. The cubic root of 197931870 is about 582.7808097947.

The spelling of 197931870 in words is "one hundred ninety-seven million, nine hundred thirty-one thousand, eight hundred seventy".