2155398 has 64 divisors (see below), whose sum is σ = 5399040. Its totient is φ = 559872.

The previous prime is 2155397. The next prime is 2155409. The reversal of 2155398 is 8935512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29490 + ... + 29562.

It is an arithmetic number, because the mean of its divisors is an integer number (84360).

2^2155398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2699520).

2155398 is an abundant number, since it is smaller than the sum of its proper divisors (3243642).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155398 is a wasteful number, since it uses less digits than its factorization.

2155398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its digits is 10800, while the sum is 33.

The square root of 2155398 is about 1468.1273786698. The cubic root of 2155398 is about 129.1742132716.

The spelling of 2155398 in words is "two million, one hundred fifty-five thousand, three hundred ninety-eight".