408243691 has 8 divisors (see below), whose sum is σ = 412806240. Its totient is φ = 403706688.

The previous prime is 408243679. The next prime is 408243707. The reversal of 408243691 is 196342804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 408243691 - 2²¹ = 406146539 is a prime.

It is a super-2 number, since 2×408243691² = 333325822482606962, which contains 22 as substring.

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 408243691.

It is not an unprimeable number, because it can be changed into a prime (408240691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26695 + ... + 39103.

It is an arithmetic number, because the mean of its divisors is an integer number (51600780).

Almost surely, 2^408243691 is an apocalyptic number.

408243691 is a deficient number, since it is larger than the sum of its proper divisors (4562549).

408243691 is a wasteful number, since it uses less digits than its factorization.

408243691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12773.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 408243691 is about 20205.0412273769. The cubic root of 408243691 is about 741.8335896531.

The spelling of 408243691 in words is "four hundred eight million, two hundred forty-three thousand, six hundred ninety-one".