1965139 has 8 divisors (see below), whose sum is σ = 2155968. Its totient is φ = 1776360.

The previous prime is 1965133. The next prime is 1965167. The reversal of 1965139 is 9315691.

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 1965139 - 2¹⁷ = 1834067 is a prime.

It is a Duffinian number.

1965139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1965133) 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, 2104 + ... + 2890.

It is an arithmetic number, because the mean of its divisors is an integer number (269496).

2^1965139 is an apocalyptic number.

1965139 is a deficient number, since it is larger than the sum of its proper divisors (190829).

1965139 is a wasteful number, since it uses less digits than its factorization.

1965139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025.

The product of its digits is 7290, while the sum is 34.

The square root of 1965139 is about 1401.8341556689. The cubic root of 1965139 is about 125.2557749431.

It can be divided in two parts, 196 and 5139, that added together give a palindrome (5335).

The spelling of 1965139 in words is "one million, nine hundred sixty-five thousand, one hundred thirty-nine".