4392091 has 4 divisors (see below), whose sum is σ = 4791384. Its totient is φ = 3992800.

The previous prime is 4392077. The next prime is 4392107. The reversal of 4392091 is 1902934.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4392091 - 2⁹ = 4391579 is a prime.

It is a Duffinian number.

4392091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4392691) 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, 199630 + ... + 199651.

It is an arithmetic number, because the mean of its divisors is an integer number (1197846).

Almost surely, 2^4392091 is an apocalyptic number.

4392091 is a deficient number, since it is larger than the sum of its proper divisors (399293).

4392091 is a wasteful number, since it uses less digits than its factorization.

4392091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399292.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 4392091 is about 2095.7316144965. The cubic root of 4392091 is about 163.7660132350.

The spelling of 4392091 in words is "four million, three hundred ninety-two thousand, ninety-one".