409791421 has 8 divisors (see below), whose sum is σ = 443754584. Its totient is φ = 376176960.

The previous prime is 409791401. The next prime is 409791439. The reversal of 409791421 is 124197904.

It can be written as a sum of positive squares in 4 ways, for example, as 37687321 + 372104100 = 6139^2 + 19290^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409791421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409791401) 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, 84726 + ... + 89431.

It is an arithmetic number, because the mean of its divisors is an integer number (55469323).

Almost surely, 2^409791421 is an apocalyptic number.

It is an amenable number.

409791421 is a deficient number, since it is larger than the sum of its proper divisors (33963163).

409791421 is a wasteful number, since it uses less digits than its factorization.

409791421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174351.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 409791421 is about 20243.3055848100. The cubic root of 409791421 is about 742.7698851493.

The spelling of 409791421 in words is "four hundred nine million, seven hundred ninety-one thousand, four hundred twenty-one".