198721534 has 32 divisors (see below), whose sum is σ = 345254400. Its totient is φ = 84781440.

The previous prime is 198721507. The next prime is 198721559. The reversal of 198721534 is 435127891.

It is a super-3 number, since 3×198721534³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268537 + ... + 269275.

It is an arithmetic number, because the mean of its divisors is an integer number (10789200).

Almost surely, 2^198721534 is an apocalyptic number.

198721534 is a deficient number, since it is larger than the sum of its proper divisors (146532866).

198721534 is a wasteful number, since it uses less digits than its factorization.

198721534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488.

The product of its digits is 60480, while the sum is 40.

The square root of 198721534 is about 14096.8625587398. The cubic root of 198721534 is about 583.5547972887.

The spelling of 198721534 in words is "one hundred ninety-eight million, seven hundred twenty-one thousand, five hundred thirty-four".