1698139 has 2 divisors, whose sum is σ = 1698140. Its totient is φ = 1698138.

The previous prime is 1698133. The next prime is 1698167. The reversal of 1698139 is 9318961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1698139 - 2³ = 1698131 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1698098 and 1698107.

It is not a weakly prime, because it can be changed into another prime (1698131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 849069 + 849070.

It is an arithmetic number, because the mean of its divisors is an integer number (849070).

2^1698139 is an apocalyptic number.

1698139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1698139 is an equidigital number, since it uses as much as digits as its factorization.

1698139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 37.

The square root of 1698139 is about 1303.1266246992. The cubic root of 1698139 is about 119.3047528557.

It can be divided in two parts, 16981 and 39, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 1698139 in words is "one million, six hundred ninety-eight thousand, one hundred thirty-nine".