2421729 has 12 divisors (see below), whose sum is σ = 3564756. Its totient is φ = 1583712.

The previous prime is 2421707. The next prime is 2421733. The reversal of 2421729 is 9271242.

It can be written as a sum of positive squares in 2 ways, for example, as 2117025 + 304704 = 1455^2 + 552^2 .

It is not a de Polignac number, because 2421729 - 2⁸ = 2421473 is a prime.

It is an Ulam number.

2421729 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2421229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2062 + ... + 3015.

It is an arithmetic number, because the mean of its divisors is an integer number (297063).

2^2421729 is an apocalyptic number.

It is an amenable number.

2421729 is a deficient number, since it is larger than the sum of its proper divisors (1143027).

2421729 is a wasteful number, since it uses less digits than its factorization.

2421729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136 (or 5133 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 2421729 is about 1556.1905410328. The cubic root of 2421729 is about 134.2894352695.

The spelling of 2421729 in words is "two million, four hundred twenty-one thousand, seven hundred twenty-nine".