2155923 has 64 divisors (see below), whose sum is σ = 4285440. Its totient is φ = 1036800.

The previous prime is 2155883. The next prime is 2155931. The reversal of 2155923 is 3295512.

It is not a de Polignac number, because 2155923 - 2⁸ = 2155667 is a prime.

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

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2155963) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35313 + ... + 35373.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2^2155923 is an apocalyptic number.

2155923 is a deficient number, since it is larger than the sum of its proper divisors (2129517).

2155923 is a wasteful number, since it uses less digits than its factorization.

2155923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 99 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

The square root of 2155923 is about 1468.3061669829. The cubic root of 2155923 is about 129.1847002686.

The spelling of 2155923 in words is "two million, one hundred fifty-five thousand, nine hundred twenty-three".