2156415 has 16 divisors (see below), whose sum is σ = 3470688. Its totient is φ = 1143296.

The previous prime is 2156393. The next prime is 2156417. The reversal of 2156415 is 5146512.

It is a cyclic number.

It is not a de Polignac number, because 2156415 - 2⁵ = 2156383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187 + ... + 3803.

It is an arithmetic number, because the mean of its divisors is an integer number (216918).

2^2156415 is an apocalyptic number.

2156415 is a deficient number, since it is larger than the sum of its proper divisors (1314273).

2156415 is a wasteful number, since it uses less digits than its factorization.

2156415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858.

The product of its digits is 1200, while the sum is 24.

The square root of 2156415 is about 1468.4736974151. The cubic root of 2156415 is about 129.1945265376.

The spelling of 2156415 in words is "two million, one hundred fifty-six thousand, four hundred fifteen".