1980931 has 4 divisors (see below), whose sum is σ = 2044864. Its totient is φ = 1917000.

The previous prime is 1980929. The next prime is 1980941. The reversal of 1980931 is 1390891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1980931 - 2¹ = 1980929 is a prime.

It is a super-2 number, since 2×1980931² = 7848175253522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 63901 = 1980931 / (1 + 9 + 8 + 0 + 9 + 3 + 1).

It is a Duffinian number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1980893 and 1980902.

It is not an unprimeable number, because it can be changed into a prime (1980911) 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, 31920 + ... + 31981.

It is an arithmetic number, because the mean of its divisors is an integer number (511216).

2^1980931 is an apocalyptic number.

1980931 is a deficient number, since it is larger than the sum of its proper divisors (63933).

1980931 is an equidigital number, since it uses as much as digits as its factorization.

1980931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63932.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1980931 is about 1407.4555055134. The cubic root of 1980931 is about 125.5904016831.

The spelling of 1980931 in words is "one million, nine hundred eighty thousand, nine hundred thirty-one".