409426491 has 4 divisors (see below), whose sum is σ = 545901992. Its totient is φ = 272950992.

The previous prime is 409426477. The next prime is 409426513. The reversal of 409426491 is 194624904.

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

It is not a de Polignac number, because 409426491 - 2⁷ = 409426363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409426411) 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, 68237746 + ... + 68237751.

It is an arithmetic number, because the mean of its divisors is an integer number (136475498).

Almost surely, 2^409426491 is an apocalyptic number.

409426491 is a deficient number, since it is larger than the sum of its proper divisors (136475501).

409426491 is a wasteful number, since it uses less digits than its factorization.

409426491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136475500.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 409426491 is about 20234.2899801303. The cubic root of 409426491 is about 742.5493343179.

The spelling of 409426491 in words is "four hundred nine million, four hundred twenty-six thousand, four hundred ninety-one".