1868471638 has 16 divisors (see below), whose sum is σ = 3079500480. Its totient is φ = 843193800.

The previous prime is 1868471617. The next prime is 1868471669. The reversal of 1868471638 is 8361748681.

It is a congruent number.

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, 302448 + ... + 308563.

It is an arithmetic number, because the mean of its divisors is an integer number (192468780).

Almost surely, 2^1868471638 is an apocalyptic number.

1868471638 is a deficient number, since it is larger than the sum of its proper divisors (1211028842).

1868471638 is a wasteful number, since it uses less digits than its factorization.

1868471638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611163.

The product of its digits is 1548288, while the sum is 52.

The square root of 1868471638 is about 43225.8214265501. The cubic root of 1868471638 is about 1231.6732329502.

The spelling of 1868471638 in words is "one billion, eight hundred sixty-eight million, four hundred seventy-one thousand, six hundred thirty-eight".