1491839 has 2 divisors, whose sum is σ = 1491840. Its totient is φ = 1491838.

The previous prime is 1491821. The next prime is 1491851. The reversal of 1491839 is 9381941.

It is a strong prime.

It is an emirp because it is prime and its reverse (9381941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1491839 - 2⁸ = 1491583 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1491799 and 1491808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745919 + 745920.

It is an arithmetic number, because the mean of its divisors is an integer number (745920).

2^1491839 is an apocalyptic number.

1491839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491839 is an equidigital number, since it uses as much as digits as its factorization.

1491839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 1491839 is about 1221.4086130366. The cubic root of 1491839 is about 114.2634463311.

The spelling of 1491839 in words is "one million, four hundred ninety-one thousand, eight hundred thirty-nine".