1213989 has 8 divisors (see below), whose sum is σ = 1849920. Its totient is φ = 693696.

The previous prime is 1213981. The next prime is 1214011. The reversal of 1213989 is 9893121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213989 - 2³ = 1213981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213981) 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, 28884 + ... + 28925.

It is an arithmetic number, because the mean of its divisors is an integer number (231240).

2^1213989 is an apocalyptic number.

It is an amenable number.

1213989 is a deficient number, since it is larger than the sum of its proper divisors (635931).

1213989 is an equidigital number, since it uses as much as digits as its factorization.

1213989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57819.

The product of its digits is 3888, while the sum is 33.

The square root of 1213989 is about 1101.8116898999. The cubic root of 1213989 is about 106.6771940565.

The spelling of 1213989 in words is "one million, two hundred thirteen thousand, nine hundred eighty-nine".