1980139 has 16 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 1617000.

The previous prime is 1980113. The next prime is 1980169. The reversal of 1980139 is 9310891.

It is not a de Polignac number, because 1980139 - 2¹¹ = 1978091 is a prime.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 1980139.

It is not an unprimeable number, because it can be changed into a prime (1980169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7764 + ... + 8014.

It is an arithmetic number, because the mean of its divisors is an integer number (151200).

2^1980139 is an apocalyptic number.

1980139 is a deficient number, since it is larger than the sum of its proper divisors (439061).

1980139 is an equidigital number, since it uses as much as digits as its factorization.

1980139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 281 counting only the distinct ones).

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

The square root of 1980139 is about 1407.1741185795. The cubic root of 1980139 is about 125.5736619351.

The spelling of 1980139 in words is "one million, nine hundred eighty thousand, one hundred thirty-nine".