1981959706 has 8 divisors (see below), whose sum is σ = 2991178944. Its totient is φ = 984900060.

The previous prime is 1981959701. The next prime is 1981959713. The reversal of 1981959706 is 6079591891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-4 number, since 4×1981959706⁴ (a number of 38 digits) contains 4444 as substring.

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 3 ways as a sum of consecutive naturals, for example, 3039490 + ... + 3040141.

It is an arithmetic number, because the mean of its divisors is an integer number (373897368).

Almost surely, 2^1981959706 is an apocalyptic number.

1981959706 is a deficient number, since it is larger than the sum of its proper divisors (1009219238).

1981959706 is a wasteful number, since it uses less digits than its factorization.

1981959706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6079796.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The square root of 1981959706 is about 44519.2060351485. The cubic root of 1981959706 is about 1256.1213779983.

The spelling of 1981959706 in words is "one billion, nine hundred eighty-one million, nine hundred fifty-nine thousand, seven hundred six".