1355391 has 12 divisors (see below), whose sum is σ = 1985568. Its totient is φ = 890784.

The previous prime is 1355371. The next prime is 1355399. The reversal of 1355391 is 1935531.

It is a de Polignac number, because none of the positive numbers 2^k-1355391 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375 + ... + 1688.

It is an arithmetic number, because the mean of its divisors is an integer number (165464).

2^1355391 is an apocalyptic number.

1355391 is a deficient number, since it is larger than the sum of its proper divisors (630177).

1355391 is a wasteful number, since it uses less digits than its factorization.

1355391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2139 counting only the distinct ones).

The product of its digits is 2025, while the sum is 27.

The square root of 1355391 is about 1164.2126094490. The cubic root of 1355391 is about 110.6678652231.

The spelling of 1355391 in words is "one million, three hundred fifty-five thousand, three hundred ninety-one".