47091986 has 4 divisors (see below), whose sum is σ = 70637982. Its totient is φ = 23545992.

The previous prime is 47091983. The next prime is 47091997. The reversal of 47091986 is 68919074.

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., 43151761 + 3940225 = 6569^2 + 1985^2 .

It is not an unprimeable number, because it can be changed into a prime (47091983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11772995 + ... + 11772998.

Almost surely, 2^47091986 is an apocalyptic number.

47091986 is a deficient number, since it is larger than the sum of its proper divisors (23545996).

47091986 is a wasteful number, since it uses less digits than its factorization.

47091986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23545995.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 47091986 is about 6862.3600896485. The cubic root of 47091986 is about 361.1178882585.

The spelling of 47091986 in words is "forty-seven million, ninety-one thousand, nine hundred eighty-six".