1301989 has 4 divisors (see below), whose sum is σ = 1402156. Its totient is φ = 1201824.

The previous prime is 1301959. The next prime is 1302017. The reversal of 1301989 is 9891031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9891031 = 101 ⋅97931.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 613089 = 830^2 + 783^2 .

It is not a de Polignac number, because 1301989 - 2⁵ = 1301957 is a prime.

It is a super-2 number, since 2×1301989² = 3390350712242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1301989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301929) 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, 50064 + ... + 50089.

It is an arithmetic number, because the mean of its divisors is an integer number (350539).

2^1301989 is an apocalyptic number.

It is an amenable number.

1301989 is a deficient number, since it is larger than the sum of its proper divisors (100167).

1301989 is a wasteful number, since it uses less digits than its factorization.

1301989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100166.

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

The square root of 1301989 is about 1141.0473259247. The cubic root of 1301989 is about 109.1949209801.

The spelling of 1301989 in words is "one million, three hundred one thousand, nine hundred eighty-nine".