197974797 has 4 divisors (see below), whose sum is σ = 263966400. Its totient is φ = 131983196.

The previous prime is 197974697. The next prime is 197974801. The reversal of 197974797 is 797479791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797479791 = 3 ⋅265826597.

It is a cyclic number.

It is not a de Polignac number, because 197974797 - 2⁸ = 197974541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197974797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197974397) 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, 32995797 + ... + 32995802.

It is an arithmetic number, because the mean of its divisors is an integer number (65991600).

Almost surely, 2^197974797 is an apocalyptic number.

It is an amenable number.

197974797 is a deficient number, since it is larger than the sum of its proper divisors (65991603).

197974797 is an equidigital number, since it uses as much as digits as its factorization.

197974797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65991602.

The product of its digits is 7001316, while the sum is 60.

The square root of 197974797 is about 14070.3517013613. The cubic root of 197974797 is about 582.8229374614.

The spelling of 197974797 in words is "one hundred ninety-seven million, nine hundred seventy-four thousand, seven hundred ninety-seven".