1938989 has 4 divisors (see below), whose sum is σ = 2088156. Its totient is φ = 1789824.

The previous prime is 1938983. The next prime is 1938997. The reversal of 1938989 is 9898391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9898391 = 193 ⋅51287.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 1729225 = 458^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1938989 - 2⁴ = 1938973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938983) 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, 74564 + ... + 74589.

It is an arithmetic number, because the mean of its divisors is an integer number (522039).

2^1938989 is an apocalyptic number.

It is an amenable number.

1938989 is a deficient number, since it is larger than the sum of its proper divisors (149167).

1938989 is a wasteful number, since it uses less digits than its factorization.

1938989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149166.

The product of its digits is 139968, while the sum is 47.

The square root of 1938989 is about 1392.4758525734. The cubic root of 1938989 is about 124.6977015143.

The spelling of 1938989 in words is "one million, nine hundred thirty-eight thousand, nine hundred eighty-nine".