1981962397 has 8 divisors (see below), whose sum is σ = 2016370080. Its totient is φ = 1947582000.

The previous prime is 1981962383. The next prime is 1981962403. The reversal of 1981962397 is 7932691891.

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

It is a cyclic number.

It is not a de Polignac number, because 1981962397 - 2²⁷ = 1847744669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981962347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186643 + ... + 196975.

It is an arithmetic number, because the mean of its divisors is an integer number (252046260).

Almost surely, 2^1981962397 is an apocalyptic number.

It is an amenable number.

1981962397 is a deficient number, since it is larger than the sum of its proper divisors (34407683).

1981962397 is a wasteful number, since it uses less digits than its factorization.

1981962397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13643.

The product of its digits is 1469664, while the sum is 55.

The square root of 1981962397 is about 44519.2362580492. The cubic root of 1981962397 is about 1256.1219464964.

The spelling of 1981962397 in words is "one billion, nine hundred eighty-one million, nine hundred sixty-two thousand, three hundred ninety-seven".