2155599 has 16 divisors (see below), whose sum is σ = 3304800. Its totient is φ = 1387008.

The previous prime is 2155597. The next prime is 2155603. The reversal of 2155599 is 9955512.

It is not a de Polignac number, because 2155599 - 2¹ = 2155597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155597) 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, 594 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (206550).

2^2155599 is an apocalyptic number.

2155599 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2155599 is a deficient number, since it is larger than the sum of its proper divisors (1149201).

2155599 is a wasteful number, since it uses less digits than its factorization.

2155599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791 (or 2785 counting only the distinct ones).

The product of its digits is 20250, while the sum is 36.

The square root of 2155599 is about 1468.1958316247. The cubic root of 2155599 is about 129.1782284945.

The spelling of 2155599 in words is "two million, one hundred fifty-five thousand, five hundred ninety-nine".