4090240891 has 4 divisors (see below), whose sum is σ = 4462080984. Its totient is φ = 3718400800.

The previous prime is 4090240859. The next prime is 4090240897. The reversal of 4090240891 is 1980420904.

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 4090240891 - 2⁵ = 4090240859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4090240891.

It is not an unprimeable number, because it can be changed into a prime (4090240897) 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, 185920030 + ... + 185920051.

It is an arithmetic number, because the mean of its divisors is an integer number (1115520246).

Almost surely, 2^4090240891 is an apocalyptic number.

4090240891 is a deficient number, since it is larger than the sum of its proper divisors (371840093).

4090240891 is a wasteful number, since it uses less digits than its factorization.

4090240891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371840092.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 4090240891 is about 63954.9911343908. The cubic root of 4090240891 is about 1599.2497642871.

The spelling of 4090240891 in words is "four billion, ninety million, two hundred forty thousand, eight hundred ninety-one".