198979956 has 48 divisors (see below), whose sum is σ = 589572480. Its totient is φ = 56851200.

The previous prime is 198979943. The next prime is 198979993. The reversal of 198979956 is 659979891.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 198979893 and 198979902.

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, 130845 + ... + 132356.

It is an arithmetic number, because the mean of its divisors is an integer number (12282760).

Almost surely, 2^198979956 is an apocalyptic number.

It is an amenable number.

198979956 is an abundant number, since it is smaller than the sum of its proper divisors (390592524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198979956 is a wasteful number, since it uses less digits than its factorization.

198979956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263221 (or 263213 counting only the distinct ones).

The product of its digits is 11022480, while the sum is 63.

The square root of 198979956 is about 14106.0255210318. The cubic root of 198979956 is about 583.8076436924.

The spelling of 198979956 in words is "one hundred ninety-eight million, nine hundred seventy-nine thousand, nine hundred fifty-six".