1981507930 has 16 divisors (see below), whose sum is σ = 3776521320. Its totient is φ = 745979392.

The previous prime is 1981507909. The next prime is 1981507943. The reversal of 1981507930 is 397051891.

It can be written as a sum of positive squares in 4 ways, for example, as 1338023241 + 643484689 = 36579^2 + 25367^2 .

It is an unprimeable number.

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, 5827795 + ... + 5828134.

Almost surely, 2^1981507930 is an apocalyptic number.

1981507930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981507930 is a deficient number, since it is larger than the sum of its proper divisors (1795013390).

1981507930 is a wasteful number, since it uses less digits than its factorization.

1981507930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11655953.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 1981507930 is about 44514.1318010359. The cubic root of 1981507930 is about 1256.0259289311.

The spelling of 1981507930 in words is "one billion, nine hundred eighty-one million, five hundred seven thousand, nine hundred thirty".