2991729 has 16 divisors (see below), whose sum is σ = 4402944. Its totient is φ = 1795200.

The previous prime is 2991719. The next prime is 2991731. The reversal of 2991729 is 9271992.

It is a happy number.

It is not a de Polignac number, because 2991729 - 2⁷ = 2991601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2991719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 664 + ... + 2534.

It is an arithmetic number, because the mean of its divisors is an integer number (275184).

2^2991729 is an apocalyptic number.

It is an amenable number.

2991729 is a deficient number, since it is larger than the sum of its proper divisors (1411215).

2991729 is a wasteful number, since it uses less digits than its factorization.

2991729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928.

The product of its digits is 20412, while the sum is 39.

The square root of 2991729 is about 1729.6615275828. The cubic root of 2991729 is about 144.0922923015.

The spelling of 2991729 in words is "two million, nine hundred ninety-one thousand, seven hundred twenty-nine".