2155726 has 4 divisors (see below), whose sum is σ = 3233592. Its totient is φ = 1077862.

The previous prime is 2155723. The next prime is 2155733. The reversal of 2155726 is 6275512.

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁴ + 1 + 5⁵ + 5⁸ + 7⁵ + 2¹⁶ + 6⁸ .

It is a junction number, because it is equal to n+sod(n) for n = 2155694 and 2155703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538930 + ... + 538933.

It is an arithmetic number, because the mean of its divisors is an integer number (808398).

2^2155726 is an apocalyptic number.

2155726 is a deficient number, since it is larger than the sum of its proper divisors (1077866).

2155726 is a wasteful number, since it uses less digits than its factorization.

2155726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077865.

The product of its digits is 4200, while the sum is 28.

The square root of 2155726 is about 1468.2390813488. The cubic root of 2155726 is about 129.1807653474.

The spelling of 2155726 in words is "two million, one hundred fifty-five thousand, seven hundred twenty-six".