1981008774 has 36 divisors (see below), whose sum is σ = 4309450236. Its totient is φ = 657688896.

The previous prime is 1981008769. The next prime is 1981008829. The reversal of 1981008774 is 4778001891.

1981008774 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3374509 + ... + 3375095.

It is an arithmetic number, because the mean of its divisors is an integer number (119706951).

Almost surely, 2^1981008774 is an apocalyptic number.

1981008774 is an abundant number, since it is smaller than the sum of its proper divisors (2328441462).

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

1981008774 is an equidigital number, since it uses as much as digits as its factorization.

1981008774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1981008774 is about 44508.5247340327. The cubic root of 1981008774 is about 1255.9204527731.

The spelling of 1981008774 in words is "one billion, nine hundred eighty-one million, eight thousand, seven hundred seventy-four".