1868626389 has 16 divisors (see below), whose sum is σ = 2853107712. Its totient is φ = 1065657648.

The previous prime is 1868626387. The next prime is 1868626391. The reversal of 1868626389 is 9836268681.

It is an interprime number because it is at equal distance from previous prime (1868626387) and next prime (1868626391).

It is not a de Polignac number, because 1868626389 - 2¹ = 1868626387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868626387) 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 in 15 ways as a sum of consecutive naturals, for example, 77889 + ... + 99014.

It is an arithmetic number, because the mean of its divisors is an integer number (178319232).

Almost surely, 2^1868626389 is an apocalyptic number.

It is an amenable number.

1868626389 is a deficient number, since it is larger than the sum of its proper divisors (984481323).

1868626389 is a wasteful number, since it uses less digits than its factorization.

1868626389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177416.

The product of its digits is 5971968, while the sum is 57.

The square root of 1868626389 is about 43227.6114190918. The cubic root of 1868626389 is about 1231.7072353221.

The spelling of 1868626389 in words is "one billion, eight hundred sixty-eight million, six hundred twenty-six thousand, three hundred eighty-nine".