1918939 has 6 divisors (see below), whose sum is σ = 2109380. Its totient is φ = 1744380.

The previous prime is 1918933. The next prime is 1918967. The reversal of 1918939 is 9398191.

It is not a de Polignac number, because 1918939 - 2⁷ = 1918811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918933) 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, 7809 + ... + 8050.

2^1918939 is an apocalyptic number.

1918939 is a deficient number, since it is larger than the sum of its proper divisors (190441).

1918939 is a wasteful number, since it uses less digits than its factorization.

1918939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15881 (or 15870 counting only the distinct ones).

The product of its digits is 17496, while the sum is 40.

The square root of 1918939 is about 1385.2577377514. The cubic root of 1918939 is about 124.2664017580.

The spelling of 1918939 in words is "one million, nine hundred eighteen thousand, nine hundred thirty-nine".