1939689 has 6 divisors (see below), whose sum is σ = 2801786. Its totient is φ = 1293120.

The previous prime is 1939681. The next prime is 1939699. The reversal of 1939689 is 9869391.

It can be written as a sum of positive squares in only one way, i.e., 1937664 + 2025 = 1392^2 + 45^2 .

It is not a de Polignac number, because 1939689 - 2³ = 1939681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1939681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107752 + ... + 107769.

2^1939689 is an apocalyptic number.

It is an amenable number.

1939689 is a deficient number, since it is larger than the sum of its proper divisors (862097).

1939689 is a wasteful number, since it uses less digits than its factorization.

1939689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215527 (or 215524 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1939689 is about 1392.7271807501. The cubic root of 1939689 is about 124.7127055343.

It can be divided in two parts, 1939 and 689, that added together give a triangular number (2628 = T₇₂).

The spelling of 1939689 in words is "one million, nine hundred thirty-nine thousand, six hundred eighty-nine".