1980045 has 20 divisors (see below), whose sum is σ = 3550140. Its totient is φ = 1055808.

The previous prime is 1980031. The next prime is 1980053. The reversal of 1980045 is 5400891.

It can be written as a sum of positive squares in 2 ways, for example, as 1052676 + 927369 = 1026^2 + 963^2 .

It is not a de Polignac number, because 1980045 - 2⁴ = 1980029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2040 + ... + 2849.

It is an arithmetic number, because the mean of its divisors is an integer number (177507).

2^1980045 is an apocalyptic number.

1980045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1980045 is a deficient number, since it is larger than the sum of its proper divisors (1570095).

1980045 is an equidigital number, since it uses as much as digits as its factorization.

1980045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4906 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1980045 is about 1407.1407179099. The cubic root of 1980045 is about 125.5716748505.

The spelling of 1980045 in words is "one million, nine hundred eighty thousand, forty-five".