1931899998 has 16 divisors (see below), whose sum is σ = 4415771520. Its totient is φ = 551971416.

The previous prime is 1931899987. The next prime is 1931899999. The reversal of 1931899998 is 8999981391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1931899999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22998768 + ... + 22998851.

It is an arithmetic number, because the mean of its divisors is an integer number (275985720).

Almost surely, 2^1931899998 is an apocalyptic number.

1931899998 is an abundant number, since it is smaller than the sum of its proper divisors (2483871522).

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

1931899998 is a wasteful number, since it uses less digits than its factorization.

1931899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45997631.

The product of its digits is 11337408, while the sum is 66.

The square root of 1931899998 is about 43953.3843748124. The cubic root of 1931899998 is about 1245.4554975941.

It can be divided in two parts, 19318 and 99998, that added together give a triangular number (119316 = T₄₈₈).

The spelling of 1931899998 in words is "one billion, nine hundred thirty-one million, eight hundred ninety-nine thousand, nine hundred ninety-eight".