418328921 has 4 divisors (see below), whose sum is σ = 418382052. Its totient is φ = 418275792.

The previous prime is 418328917. The next prime is 418328941. The reversal of 418328921 is 129823814.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129823814 = 2 ⋅64911907.

It can be written as a sum of positive squares in 2 ways, for example, as 200618896 + 217710025 = 14164^2 + 14755^2 .

It is a cyclic number.

It is not a de Polignac number, because 418328921 - 2² = 418328917 is a prime.

It is a super-2 number, since 2×418328921² = 349998172290048482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (418328941) 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, 12146 + ... + 31371.

It is an arithmetic number, because the mean of its divisors is an integer number (104595513).

Almost surely, 2^418328921 is an apocalyptic number.

It is an amenable number.

418328921 is a deficient number, since it is larger than the sum of its proper divisors (53131).

418328921 is an equidigital number, since it uses as much as digits as its factorization.

418328921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53130.

The product of its digits is 27648, while the sum is 38.

The square root of 418328921 is about 20453.0907444327. The cubic root of 418328921 is about 747.8927044713.

The spelling of 418328921 in words is "four hundred eighteen million, three hundred twenty-eight thousand, nine hundred twenty-one".