2421691 has 8 divisors (see below), whose sum is σ = 2479680. Its totient is φ = 2364552.

The previous prime is 2421673. The next prime is 2421707. The reversal of 2421691 is 1961242.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2421691 - 2⁵ = 2421659 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 4⁹ + 2²¹ + 1 + 6⁴ + 9⁵ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13440 + ... + 13618.

It is an arithmetic number, because the mean of its divisors is an integer number (309960).

2^2421691 is an apocalyptic number.

2421691 is a deficient number, since it is larger than the sum of its proper divisors (57989).

2421691 is a wasteful number, since it uses less digits than its factorization.

2421691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its digits is 864, while the sum is 25.

The square root of 2421691 is about 1556.1783316831. The cubic root of 2421691 is about 134.2887328753.

The spelling of 2421691 in words is "two million, four hundred twenty-one thousand, six hundred ninety-one".