1981959707 has 16 divisors (see below), whose sum is σ = 2455723200. Its totient is φ = 1557608832.

The previous prime is 1981959701. The next prime is 1981959713. The reversal of 1981959707 is 7079591891.

It is an interprime number because it is at equal distance from previous prime (1981959701) and next prime (1981959713).

It is not a de Polignac number, because 1981959707 - 2⁴ = 1981959691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1981959701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59528 + ... + 86645.

It is an arithmetic number, because the mean of its divisors is an integer number (153482700).

Almost surely, 2^1981959707 is an apocalyptic number.

1981959707 is a deficient number, since it is larger than the sum of its proper divisors (473763493).

1981959707 is a wasteful number, since it uses less digits than its factorization.

1981959707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146342.

The product of its (nonzero) digits is 1428840, while the sum is 56.

The square root of 1981959707 is about 44519.2060463796. The cubic root of 1981959707 is about 1256.1213782095.

The spelling of 1981959707 in words is "one billion, nine hundred eighty-one million, nine hundred fifty-nine thousand, seven hundred seven".