147981866 has 4 divisors (see below), whose sum is σ = 221972802. Its totient is φ = 73990932.

The previous prime is 147981863. The next prime is 147981881. The reversal of 147981866 is 668189741.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668189741 = 47 ⋅14216803.

It can be written as a sum of positive squares in only one way, i.e., 123765625 + 24216241 = 11125^2 + 4921^2 .

It is not an unprimeable number, because it can be changed into a prime (147981863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36995465 + ... + 36995468.

Almost surely, 2^147981866 is an apocalyptic number.

147981866 is a deficient number, since it is larger than the sum of its proper divisors (73990936).

147981866 is an equidigital number, since it uses as much as digits as its factorization.

147981866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73990935.

The product of its digits is 580608, while the sum is 50.

The square root of 147981866 is about 12164.7797349562. The cubic root of 147981866 is about 528.9356425340.

The spelling of 147981866 in words is "one hundred forty-seven million, nine hundred eighty-one thousand, eight hundred sixty-six".