2115729 has 48 divisors (see below), whose sum is σ = 3953664. Its totient is φ = 1058400.

The previous prime is 2115727. The next prime is 2115749. The reversal of 2115729 is 9275112.

It is not a de Polignac number, because 2115729 - 2¹ = 2115727 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29764 + ... + 29834.

It is an arithmetic number, because the mean of its divisors is an integer number (82368).

2^2115729 is an apocalyptic number.

It is an amenable number.

2115729 is a deficient number, since it is larger than the sum of its proper divisors (1837935).

2115729 is a wasteful number, since it uses less digits than its factorization.

2115729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 135 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 2115729 is about 1454.5545709942. The cubic root of 2115729 is about 128.3768395062.

The spelling of 2115729 in words is "two million, one hundred fifteen thousand, seven hundred twenty-nine".