427725989 has 2 divisors, whose sum is σ = 427725990. Its totient is φ = 427725988.

The previous prime is 427725983. The next prime is 427725997. The reversal of 427725989 is 989527724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250968964 + 176757025 = 15842^2 + 13295^2 .

It is a cyclic number.

It is not a de Polignac number, because 427725989 - 2¹² = 427721893 is a prime.

It is a Sophie Germain prime.

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 427725989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427725983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213862994 + 213862995.

It is an arithmetic number, because the mean of its divisors is an integer number (213862995).

Almost surely, 2^427725989 is an apocalyptic number.

It is an amenable number.

427725989 is a deficient number, since it is larger than the sum of its proper divisors (1).

427725989 is an equidigital number, since it uses as much as digits as its factorization.

427725989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 427725989 is about 20681.5373944975. The cubic root of 427725989 is about 753.4513459927.

The spelling of 427725989 in words is "four hundred twenty-seven million, seven hundred twenty-five thousand, nine hundred eighty-nine".