1868437538 has 16 divisors (see below), whose sum is σ = 3058188480. Its totient is φ = 849082800.

The previous prime is 1868437517. The next prime is 1868437553. The reversal of 1868437538 is 8357348681.

It is a self number, because there is not a number n which added to its sum of digits gives 1868437538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116528 + ... + 131588.

It is an arithmetic number, because the mean of its divisors is an integer number (191136780).

Almost surely, 2^1868437538 is an apocalyptic number.

1868437538 is a deficient number, since it is larger than the sum of its proper divisors (1189750942).

1868437538 is a wasteful number, since it uses less digits than its factorization.

1868437538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20713.

The product of its digits is 3870720, while the sum is 53.

The square root of 1868437538 is about 43225.4269845886. The cubic root of 1868437538 is about 1231.6657401395.

The spelling of 1868437538 in words is "one billion, eight hundred sixty-eight million, four hundred thirty-seven thousand, five hundred thirty-eight".