1981205710 has 32 divisors (see below), whose sum is σ = 3892396032. Its totient is φ = 720062880.

The previous prime is 1981205701. The next prime is 1981205719. The reversal of 1981205710 is 175021891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1981205701) and next prime (1981205719).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981205719) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 292219 + ... + 298921.

It is an arithmetic number, because the mean of its divisors is an integer number (121637376).

Almost surely, 2^1981205710 is an apocalyptic number.

1981205710 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981205710 is a deficient number, since it is larger than the sum of its proper divisors (1911190322).

1981205710 is a wasteful number, since it uses less digits than its factorization.

1981205710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9408.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 1981205710 is about 44510.7370192856. The cubic root of 1981205710 is about 1255.9620692394.

The spelling of 1981205710 in words is "one billion, nine hundred eighty-one million, two hundred five thousand, seven hundred ten".