2400091 has 4 divisors (see below), whose sum is σ = 2404384. Its totient is φ = 2395800.

The previous prime is 2400089. The next prime is 2400107. The reversal of 2400091 is 1900042.

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

It is a 3-Lehmer number, since φ(2400091) divides (2400091-1)³.

It is a cyclic number.

It is not a de Polignac number, because 2400091 - 2¹ = 2400089 is a prime.

It is a Duffinian number.

2400091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2400001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155 + ... + 2476.

It is an arithmetic number, because the mean of its divisors is an integer number (601096).

2^2400091 is an apocalyptic number.

2400091 is a deficient number, since it is larger than the sum of its proper divisors (4293).

2400091 is an equidigital number, since it uses as much as digits as its factorization.

2400091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2400091 is about 1549.2227083283. Note that the first 3 decimals coincide. The cubic root of 2400091 is about 133.8882821728. Note that the first 3 decimals are identical.

The spelling of 2400091 in words is "two million, four hundred thousand, ninety-one".