4088921 has 4 divisors (see below), whose sum is σ = 4093392. Its totient is φ = 4084452.

The previous prime is 4088911. The next prime is 4088923. The reversal of 4088921 is 1298804.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4088921 - 2¹⁸ = 3826777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4088923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (1023348).

Almost surely, 2^4088921 is an apocalyptic number.

It is an amenable number.

4088921 is a deficient number, since it is larger than the sum of its proper divisors (4471).

4088921 is a wasteful number, since it uses less digits than its factorization.

4088921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 4088921 is about 2022.1080584380. The cubic root of 4088921 is about 159.9077723689.

The spelling of 4088921 in words is "four million, eighty-eight thousand, nine hundred twenty-one".