408140891 has 4 divisors (see below), whose sum is σ = 408607152. Its totient is φ = 407674632.

The previous prime is 408140839. The next prime is 408140897. The reversal of 408140891 is 198041804.

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 408140891 - 2⁶ = 408140827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408140897) 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, 231815 + ... + 233568.

It is an arithmetic number, because the mean of its divisors is an integer number (102151788).

Almost surely, 2^408140891 is an apocalyptic number.

408140891 is a deficient number, since it is larger than the sum of its proper divisors (466261).

408140891 is an equidigital number, since it uses as much as digits as its factorization.

408140891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466260.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 408140891 is about 20202.4971476300. The cubic root of 408140891 is about 741.7713172925.

The spelling of 408140891 in words is "four hundred eight million, one hundred forty thousand, eight hundred ninety-one".