1981879298 has 32 divisors (see below), whose sum is σ = 3421440000. Its totient is φ = 843416784.

The previous prime is 1981879271. The next prime is 1981879309. The reversal of 1981879298 is 8929781891.

It is a happy number.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1981879298.

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, 1669061 + ... + 1670247.

It is an arithmetic number, because the mean of its divisors is an integer number (106920000).

Almost surely, 2^1981879298 is an apocalyptic number.

1981879298 is a deficient number, since it is larger than the sum of its proper divisors (1439560702).

1981879298 is a wasteful number, since it uses less digits than its factorization.

1981879298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934.

The product of its digits is 5225472, while the sum is 62.

The square root of 1981879298 is about 44518.3029550768. The cubic root of 1981879298 is about 1256.1043908427.

The spelling of 1981879298 in words is "one billion, nine hundred eighty-one million, eight hundred seventy-nine thousand, two hundred ninety-eight".