1690139 has 4 divisors (see below), whose sum is σ = 1843800. Its totient is φ = 1536480.

The previous prime is 1690121. The next prime is 1690153. The reversal of 1690139 is 9310961.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1690139 - 2¹⁶ = 1624603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76814 + ... + 76835.

It is an arithmetic number, because the mean of its divisors is an integer number (460950).

2^1690139 is an apocalyptic number.

1690139 is a deficient number, since it is larger than the sum of its proper divisors (153661).

1690139 is a wasteful number, since it uses less digits than its factorization.

1690139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153660.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1690139 is about 1300.0534604392. The cubic root of 1690139 is about 119.1171080759.

The spelling of 1690139 in words is "one million, six hundred ninety thousand, one hundred thirty-nine".