1898139 has 4 divisors (see below), whose sum is σ = 2530856. Its totient is φ = 1265424.

The previous prime is 1898131. The next prime is 1898153. The reversal of 1898139 is 9318981.

It is a happy number.

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

It is not a de Polignac number, because 1898139 - 2³ = 1898131 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1898097 and 1898106.

It is not an unprimeable number, because it can be changed into a prime (1898131) 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, 316354 + ... + 316359.

It is an arithmetic number, because the mean of its divisors is an integer number (632714).

2^1898139 is an apocalyptic number.

1898139 is a deficient number, since it is larger than the sum of its proper divisors (632717).

1898139 is an equidigital number, since it uses as much as digits as its factorization.

1898139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632716.

The product of its digits is 15552, while the sum is 39.

The square root of 1898139 is about 1377.7296541775. The cubic root of 1898139 is about 123.8157817796.

The spelling of 1898139 in words is "one million, eight hundred ninety-eight thousand, one hundred thirty-nine".