1981964490 has 32 divisors (see below), whose sum is σ = 5189144256. Its totient is φ = 480476160.

The previous prime is 1981964449. The next prime is 1981964507. The reversal of 1981964490 is 944691891.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3002647 + ... + 3003306.

It is an arithmetic number, because the mean of its divisors is an integer number (162160758).

Almost surely, 2^1981964490 is an apocalyptic number.

1981964490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981964490 is an abundant number, since it is smaller than the sum of its proper divisors (3207179766).

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

1981964490 is a wasteful number, since it uses less digits than its factorization.

1981964490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005974.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 1981964490 is about 44519.2597647355. The cubic root of 1981964490 is about 1256.1223886613.

The spelling of 1981964490 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-four thousand, four hundred ninety".