427429661 has 4 divisors (see below), whose sum is σ = 438981852. Its totient is φ = 415877472.

The previous prime is 427429621. The next prime is 427429679. The reversal of 427429661 is 166924724.

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 410872900 + 16556761 = 20270^2 + 4069^2 .

It is a cyclic number.

It is not a de Polignac number, because 427429661 - 2¹⁴ = 427413277 is a prime.

It is a super-2 number, since 2×427429661² = 365392230205149842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427429621) 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, 5776040 + ... + 5776113.

It is an arithmetic number, because the mean of its divisors is an integer number (109745463).

Almost surely, 2^427429661 is an apocalyptic number.

It is an amenable number.

427429661 is a deficient number, since it is larger than the sum of its proper divisors (11552191).

427429661 is a wasteful number, since it uses less digits than its factorization.

427429661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552190.

The product of its digits is 145152, while the sum is 41.

The square root of 427429661 is about 20674.3720823632. The cubic root of 427429661 is about 753.2773090967.

The spelling of 427429661 in words is "four hundred twenty-seven million, four hundred twenty-nine thousand, six hundred sixty-one".