1980381 has 32 divisors (see below), whose sum is σ = 3144960. Its totient is φ = 1096704.

The previous prime is 1980371. The next prime is 1980383. The reversal of 1980381 is 1830891.

It is not a de Polignac number, because 1980381 - 2⁶ = 1980317 is a prime.

It is a super-2 number, since 2×1980381² = 7843817810322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980383) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19176 + ... + 19278.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2^1980381 is an apocalyptic number.

It is an amenable number.

1980381 is a deficient number, since it is larger than the sum of its proper divisors (1164579).

1980381 is a wasteful number, since it uses less digits than its factorization.

1980381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1980381 is about 1407.2601038898. The cubic root of 1980381 is about 125.5787773316.

The spelling of 1980381 in words is "one million, nine hundred eighty thousand, three hundred eighty-one".