197408381 has 4 divisors (see below), whose sum is σ = 198410652. Its totient is φ = 196406112.

The previous prime is 197408377. The next prime is 197408389. The reversal of 197408381 is 183804791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183804791 = 3191 ⋅57601.

It can be written as a sum of positive squares in 2 ways, for example, as 100681156 + 96727225 = 10034^2 + 9835^2 .

It is a cyclic number.

It is not a de Polignac number, because 197408381 - 2² = 197408377 is a prime.

It is a super-2 number, since 2×197408381² = 77940137778082322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197408389) 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, 500840 + ... + 501233.

It is an arithmetic number, because the mean of its divisors is an integer number (49602663).

Almost surely, 2^197408381 is an apocalyptic number.

It is an amenable number.

197408381 is a deficient number, since it is larger than the sum of its proper divisors (1002271).

197408381 is a wasteful number, since it uses less digits than its factorization.

197408381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002270.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 197408381 is about 14050.2092866975. The cubic root of 197408381 is about 582.2665778075.

The spelling of 197408381 in words is "one hundred ninety-seven million, four hundred eight thousand, three hundred eighty-one".