1249875866 has 4 divisors (see below), whose sum is σ = 1874813802. Its totient is φ = 624937932.

The previous prime is 1249875863. The next prime is 1249875871. The reversal of 1249875866 is 6685789421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6685789421 = 1429 ⋅4678649.

It can be written as a sum of positive squares in only one way, i.e., 1249269025 + 606841 = 35345^2 + 779^2 .

It is not an unprimeable number, because it can be changed into a prime (1249875863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312468965 + ... + 312468968.

Almost surely, 2^1249875866 is an apocalyptic number.

1249875866 is a deficient number, since it is larger than the sum of its proper divisors (624937936).

1249875866 is an equidigital number, since it uses as much as digits as its factorization.

1249875866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624937935.

The product of its digits is 5806080, while the sum is 56.

The square root of 1249875866 is about 35353.5834958778. The cubic root of 1249875866 is about 1077.1816853561.

The spelling of 1249875866 in words is "one billion, two hundred forty-nine million, eight hundred seventy-five thousand, eight hundred sixty-six".