2015391 has 8 divisors (see below), whose sum is σ = 3071104. Its totient is φ = 1151640.

The previous prime is 2015371. The next prime is 2015393. The reversal of 2015391 is 1935102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2015391 - 2⁵ = 2015359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 95971 = 2015391 / (2 + 0 + 1 + 5 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47965 + ... + 48006.

It is an arithmetic number, because the mean of its divisors is an integer number (383888).

2^2015391 is an apocalyptic number.

2015391 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2015391 is a deficient number, since it is larger than the sum of its proper divisors (1055713).

2015391 is an equidigital number, since it uses as much as digits as its factorization.

2015391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95981.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 2015391 is about 1419.6446738533. The cubic root of 2015391 is about 126.3144702256.

The spelling of 2015391 in words is "two million, fifteen thousand, three hundred ninety-one".