4015391 has 4 divisors (see below), whose sum is σ = 4019400. Its totient is φ = 4011384.

The previous prime is 4015381. The next prime is 4015411. The reversal of 4015391 is 1935104.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4015391 is a prime.

It is a super-2 number, since 2×4015391² = 32246729765762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4015331) 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 3 ways as a sum of consecutive naturals, for example, 965 + ... + 2993.

It is an arithmetic number, because the mean of its divisors is an integer number (1004850).

Almost surely, 2^4015391 is an apocalyptic number.

4015391 is a deficient number, since it is larger than the sum of its proper divisors (4009).

4015391 is a wasteful number, since it uses less digits than its factorization.

4015391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 4015391 is about 2003.8440558087. The cubic root of 4015391 is about 158.9434420362.

The spelling of 4015391 in words is "four million, fifteen thousand, three hundred ninety-one".