1981035650 has 24 divisors (see below), whose sum is σ = 4019702544. Its totient is φ = 720376400.

The previous prime is 1981035649. The next prime is 1981035689. The reversal of 1981035650 is 565301891.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1800392 + ... + 1801491.

It is an arithmetic number, because the mean of its divisors is an integer number (167487606).

Almost surely, 2^1981035650 is an apocalyptic number.

1981035650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981035650 is an abundant number, since it is smaller than the sum of its proper divisors (2038666894).

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

1981035650 is a wasteful number, since it uses less digits than its factorization.

1981035650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601906 (or 3601901 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1981035650 is about 44508.8266526989. The cubic root of 1981035650 is about 1255.9261323652.

The spelling of 1981035650 in words is "one billion, nine hundred eighty-one million, thirty-five thousand, six hundred fifty".