1662139 has 4 divisors (see below), whose sum is σ = 1749640. Its totient is φ = 1574640.

The previous prime is 1662121. The next prime is 1662149. The reversal of 1662139 is 9312661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9312661 = 461 ⋅20201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662139 is a prime.

It is a Duffinian number.

1662139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1662119) 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 in 3 ways as a sum of consecutive naturals, for example, 43722 + ... + 43759.

It is an arithmetic number, because the mean of its divisors is an integer number (437410).

2^1662139 is an apocalyptic number.

1662139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1662139 is a deficient number, since it is larger than the sum of its proper divisors (87501).

1662139 is an equidigital number, since it uses as much as digits as its factorization.

1662139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87500.

The product of its digits is 1944, while the sum is 28.

The square root of 1662139 is about 1289.2396984269. The cubic root of 1662139 is about 118.4556499337.

The spelling of 1662139 in words is "one million, six hundred sixty-two thousand, one hundred thirty-nine".