102489866 has 16 divisors (see below), whose sum is σ = 155898600. Its totient is φ = 50528448.

The previous prime is 102489859. The next prime is 102489869. The reversal of 102489866 is 668984201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 102434641 + 55225 = 10121^2 + 235^2 .

It is not an unprimeable number, because it can be changed into a prime (102489869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48896 + ... + 50948.

Almost surely, 2^102489866 is an apocalyptic number.

102489866 is a deficient number, since it is larger than the sum of its proper divisors (53408734).

102489866 is a wasteful number, since it uses less digits than its factorization.

102489866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 102489866 is about 10123.7278707006. The cubic root of 102489866 is about 467.9796573572.

The spelling of 102489866 in words is "one hundred two million, four hundred eighty-nine thousand, eight hundred sixty-six".