2155734 has 40 divisors (see below), whose sum is σ = 5523408. Its totient is φ = 615600.

The previous prime is 2155733. The next prime is 2155781. The reversal of 2155734 is 4375512.

It is a happy number.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2155698 and 2155707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155733) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 184 + ... + 2084.

2^2155734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2761704).

2155734 is an abundant number, since it is smaller than the sum of its proper divisors (3367674).

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

2155734 is a wasteful number, since it uses less digits than its factorization.

2155734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1913 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 2155734 is about 1468.2418056982. The cubic root of 2155734 is about 129.1809251458.

It can be divided in two parts, 21 and 55734, that added together give a palindrome (55755).

The spelling of 2155734 in words is "two million, one hundred fifty-five thousand, seven hundred thirty-four".