198408157 has 4 divisors (see below), whose sum is σ = 198436480. Its totient is φ = 198379836.

The previous prime is 198408113. The next prime is 198408193. The reversal of 198408157 is 751804891.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 198408157 - 2²³ = 190019549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198408107) 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, 4894 + ... + 20512.

It is an arithmetic number, because the mean of its divisors is an integer number (49609120).

Almost surely, 2^198408157 is an apocalyptic number.

It is an amenable number.

198408157 is a deficient number, since it is larger than the sum of its proper divisors (28323).

198408157 is a wasteful number, since it uses less digits than its factorization.

198408157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28322.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 198408157 is about 14085.7430403937. The cubic root of 198408157 is about 583.2478873122.

The spelling of 198408157 in words is "one hundred ninety-eight million, four hundred eight thousand, one hundred fifty-seven".