197398690 has 8 divisors (see below), whose sum is σ = 355317660. Its totient is φ = 78959472.

The previous prime is 197398667. The next prime is 197398693. The reversal of 197398690 is 96893791.

It can be written as a sum of positive squares in 2 ways, for example, as 183358681 + 14040009 = 13541^2 + 3747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×197398690² = 77932485627432200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197398693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9869925 + ... + 9869944.

Almost surely, 2^197398690 is an apocalyptic number.

197398690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197398690 is a deficient number, since it is larger than the sum of its proper divisors (157918970).

197398690 is a wasteful number, since it uses less digits than its factorization.

197398690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19739876.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 197398690 is about 14049.8644121572. The cubic root of 197398690 is about 582.2570496106.

The spelling of 197398690 in words is "one hundred ninety-seven million, three hundred ninety-eight thousand, six hundred ninety".