1958989 has 4 divisors (see below), whose sum is σ = 1965600. Its totient is φ = 1952380.

The previous prime is 1958959. The next prime is 1958993. The reversal of 1958989 is 9898591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9898591 = 167 ⋅59273.

It is a cyclic number.

It is not a de Polignac number, because 1958989 - 2⁷ = 1958861 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1958909) 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, 2839 + ... + 3460.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

2^1958989 is an apocalyptic number.

It is an amenable number.

1958989 is a deficient number, since it is larger than the sum of its proper divisors (6611).

1958989 is an equidigital number, since it uses as much as digits as its factorization.

1958989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6610.

The product of its digits is 233280, while the sum is 49.

The square root of 1958989 is about 1399.6388819978. The cubic root of 1958989 is about 125.1249736777.

The spelling of 1958989 in words is "one million, nine hundred fifty-eight thousand, nine hundred eighty-nine".