429995921 has 4 divisors (see below), whose sum is σ = 430187700. Its totient is φ = 429804144.

The previous prime is 429995899. The next prime is 429995927. The reversal of 429995921 is 129599924.

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 16443025 + 413552896 = 4055^2 + 20336^2 .

It is a cyclic number.

It is not a de Polignac number, because 429995921 - 2⁶ = 429995857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 429995921.

It is not an unprimeable number, because it can be changed into a prime (429995927) 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, 92486 + ... + 97023.

It is an arithmetic number, because the mean of its divisors is an integer number (107546925).

Almost surely, 2^429995921 is an apocalyptic number.

It is an amenable number.

429995921 is a deficient number, since it is larger than the sum of its proper divisors (191779).

429995921 is a wasteful number, since it uses less digits than its factorization.

429995921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191778.

The product of its digits is 524880, while the sum is 50.

The square root of 429995921 is about 20736.3429996709. The cubic root of 429995921 is about 754.7818447818.

The spelling of 429995921 in words is "four hundred twenty-nine million, nine hundred ninety-five thousand, nine hundred twenty-one".