2155598 has 4 divisors (see below), whose sum is σ = 3233400. Its totient is φ = 1077798.

The previous prime is 2155597. The next prime is 2155603. The reversal of 2155598 is 8955512.

It is a semiprime because it is the product of two primes.

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 an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538898 + ... + 538901.

It is an arithmetic number, because the mean of its divisors is an integer number (808350).

2^2155598 is an apocalyptic number.

2155598 is a deficient number, since it is larger than the sum of its proper divisors (1077802).

2155598 is a wasteful number, since it uses less digits than its factorization.

2155598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077801.

The product of its digits is 18000, while the sum is 35.

The square root of 2155598 is about 1468.1954910706. The cubic root of 2155598 is about 129.1782085189.

The spelling of 2155598 in words is "two million, one hundred fifty-five thousand, five hundred ninety-eight".