429849821 has 2 divisors, whose sum is σ = 429849822. Its totient is φ = 429849820.

The previous prime is 429849767. The next prime is 429849857. The reversal of 429849821 is 128948924.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 269320921 + 160528900 = 16411^2 + 12670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-429849821 is a prime.

It is a super-2 number, since 2×429849821² = 369541737227464082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (429849881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214924910 + 214924911.

It is an arithmetic number, because the mean of its divisors is an integer number (214924911).

Almost surely, 2^429849821 is an apocalyptic number.

It is an amenable number.

429849821 is a deficient number, since it is larger than the sum of its proper divisors (1).

429849821 is an equidigital number, since it uses as much as digits as its factorization.

429849821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 47.

The square root of 429849821 is about 20732.8198998593. The cubic root of 429849821 is about 754.6963508552.

The spelling of 429849821 in words is "four hundred twenty-nine million, eight hundred forty-nine thousand, eight hundred twenty-one".