1391859 has 12 divisors (see below), whose sum is σ = 2297776. Its totient is φ = 795312.

The previous prime is 1391849. The next prime is 1391861. The reversal of 1391859 is 9581931.

It is a happy number.

It is not a de Polignac number, because 1391859 - 2¹¹ = 1389811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391849) 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 11 ways as a sum of consecutive naturals, for example, 10984 + ... + 11109.

2^1391859 is an apocalyptic number.

1391859 is a deficient number, since it is larger than the sum of its proper divisors (905917).

1391859 is a wasteful number, since it uses less digits than its factorization.

1391859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22106 (or 22103 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1391859 is about 1179.7707404407. The cubic root of 1391859 is about 111.6516333318.

The spelling of 1391859 in words is "one million, three hundred ninety-one thousand, eight hundred fifty-nine".