427187986 has 4 divisors (see below), whose sum is σ = 640781982. Its totient is φ = 213593992.

The previous prime is 427187983. The next prime is 427188011. The reversal of 427187986 is 689781724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 412861761 + 14326225 = 20319^2 + 3785^2 .

It is not an unprimeable number, because it can be changed into a prime (427187983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106796995 + ... + 106796998.

Almost surely, 2^427187986 is an apocalyptic number.

427187986 is a deficient number, since it is larger than the sum of its proper divisors (213593996).

427187986 is a wasteful number, since it uses less digits than its factorization.

427187986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213593995.

The product of its digits is 1354752, while the sum is 52.

The square root of 427187986 is about 20668.5264593294. The cubic root of 427187986 is about 753.1353109841.

The spelling of 427187986 in words is "four hundred twenty-seven million, one hundred eighty-seven thousand, nine hundred eighty-six".