427148809 has 4 divisors (see below), whose sum is σ = 428214420. Its totient is φ = 426083200.

The previous prime is 427148803. The next prime is 427148819. The reversal of 427148809 is 908841724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 217710025 + 209438784 = 14755^2 + 14472^2 .

It is a cyclic number.

It is not a de Polignac number, because 427148809 - 2⁹ = 427148297 is a prime.

It is a super-2 number, since 2×427148809² = 364912210060236962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427148803) 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, 532204 + ... + 533005.

It is an arithmetic number, because the mean of its divisors is an integer number (107053605).

Almost surely, 2^427148809 is an apocalyptic number.

It is an amenable number.

427148809 is a deficient number, since it is larger than the sum of its proper divisors (1065611).

427148809 is a wasteful number, since it uses less digits than its factorization.

427148809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065610.

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 427148809 is about 20667.5786922416. The cubic root of 427148809 is about 753.1122871749.

The spelling of 427148809 in words is "four hundred twenty-seven million, one hundred forty-eight thousand, eight hundred nine".