1994139 has 20 divisors (see below), whose sum is σ = 3405424. Its totient is φ = 1139184.

The previous prime is 1994119. The next prime is 1994143. The reversal of 1994139 is 9314991.

It is not a de Polignac number, because 1994139 - 2⁹ = 1993627 is a prime.

It is a Duffinian number.

1994139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1994119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1192 + ... + 2325.

2^1994139 is an apocalyptic number.

1994139 is a deficient number, since it is larger than the sum of its proper divisors (1411285).

1994139 is an equidigital number, since it uses as much as digits as its factorization.

1994139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536 (or 3527 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 1994139 is about 1412.1398655941. The cubic root of 1994139 is about 125.8689112834.

The spelling of 1994139 in words is "one million, nine hundred ninety-four thousand, one hundred thirty-nine".