1981244290 has 16 divisors (see below), whose sum is σ = 3573067968. Its totient is φ = 790980336.

The previous prime is 1981244263. The next prime is 1981244327. The reversal of 1981244290 is 924421891.

It is a super-3 number, since 3×1981244290³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184182 + ... + 194641.

It is an arithmetic number, because the mean of its divisors is an integer number (223316748).

Almost surely, 2^1981244290 is an apocalyptic number.

1981244290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981244290 is a deficient number, since it is larger than the sum of its proper divisors (1591823678).

1981244290 is a wasteful number, since it uses less digits than its factorization.

1981244290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379353.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1981244290 is about 44511.1703957557. The cubic root of 1981244290 is about 1255.9702216323.

The spelling of 1981244290 in words is "one billion, nine hundred eighty-one million, two hundred forty-four thousand, two hundred ninety".