1840139 has 4 divisors (see below), whose sum is σ = 2103024. Its totient is φ = 1577256.

The previous prime is 1840123. The next prime is 1840171. The reversal of 1840139 is 9310481.

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

It is a cyclic number.

It is not a de Polignac number, because 1840139 - 2⁴ = 1840123 is a prime.

It is a super-2 number, since 2×1840139² = 6772223078642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1840109) 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, 131432 + ... + 131445.

It is an arithmetic number, because the mean of its divisors is an integer number (525756).

2^1840139 is an apocalyptic number.

1840139 is a deficient number, since it is larger than the sum of its proper divisors (262885).

1840139 is an equidigital number, since it uses as much as digits as its factorization.

1840139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262884.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1840139 is about 1356.5172317372. The cubic root of 1840139 is about 122.5415990887.

The spelling of 1840139 in words is "one million, eight hundred forty thousand, one hundred thirty-nine".