1959391 has 4 divisors (see below), whose sum is σ = 2239312. Its totient is φ = 1679472.

The previous prime is 1959371. The next prime is 1959401. The reversal of 1959391 is 1939591.

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

It is a cyclic number.

It is not a de Polignac number, because 1959391 - 2⁷ = 1959263 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1959391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1959311) 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, 139950 + ... + 139963.

It is an arithmetic number, because the mean of its divisors is an integer number (559828).

2^1959391 is an apocalyptic number.

1959391 is a deficient number, since it is larger than the sum of its proper divisors (279921).

1959391 is an equidigital number, since it uses as much as digits as its factorization.

1959391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279920.

The product of its digits is 10935, while the sum is 37.

The square root of 1959391 is about 1399.7824831023. The cubic root of 1959391 is about 125.1335319696.

The spelling of 1959391 in words is "one million, nine hundred fifty-nine thousand, three hundred ninety-one".