197926819 has 4 divisors (see below), whose sum is σ = 208344040. Its totient is φ = 187509600.

The previous prime is 197926789. The next prime is 197926831. The reversal of 197926819 is 918629791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918629791 = 151 ⋅6083641.

It is a cyclic number.

It is not a de Polignac number, because 197926819 - 2⁵ = 197926787 is a prime.

It is a super-2 number, since 2×197926819² = 78350051358917522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197926849) 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, 5208582 + ... + 5208619.

It is an arithmetic number, because the mean of its divisors is an integer number (52086010).

Almost surely, 2^197926819 is an apocalyptic number.

197926819 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

197926819 is a deficient number, since it is larger than the sum of its proper divisors (10417221).

197926819 is a wasteful number, since it uses less digits than its factorization.

197926819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10417220.

The product of its digits is 489888, while the sum is 52.

The square root of 197926819 is about 14068.6466655468. The cubic root of 197926819 is about 582.7758524477.

The spelling of 197926819 in words is "one hundred ninety-seven million, nine hundred twenty-six thousand, eight hundred nineteen".