428931869 has 2 divisors, whose sum is σ = 428931870. Its totient is φ = 428931868.

The previous prime is 428931857. The next prime is 428931887. The reversal of 428931869 is 968139824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231192025 + 197739844 = 15205^2 + 14062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428931869 is a prime.

It is a super-2 number, since 2×428931869² = 367965096487666322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428931889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214465934 + 214465935.

It is an arithmetic number, because the mean of its divisors is an integer number (214465935).

Almost surely, 2^428931869 is an apocalyptic number.

It is an amenable number.

428931869 is a deficient number, since it is larger than the sum of its proper divisors (1).

428931869 is an equidigital number, since it uses as much as digits as its factorization.

428931869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 428931869 is about 20710.6704140643. The cubic root of 428931869 is about 754.1587454550.

The spelling of 428931869 in words is "four hundred twenty-eight million, nine hundred thirty-one thousand, eight hundred sixty-nine".