1538686885 has 4 divisors (see below), whose sum is σ = 1846424268. Its totient is φ = 1230949504.

The previous prime is 1538686879. The next prime is 1538686889. The reversal of 1538686885 is 5886868351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 203661441 + 1335025444 = 14271^2 + 36538^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538686885 - 2¹³ = 1538678693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538686889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153868684 + ... + 153868693.

It is an arithmetic number, because the mean of its divisors is an integer number (461606067).

Almost surely, 2^1538686885 is an apocalyptic number.

It is an amenable number.

1538686885 is a deficient number, since it is larger than the sum of its proper divisors (307737383).

1538686885 is an equidigital number, since it uses as much as digits as its factorization.

1538686885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307737382.

The product of its digits is 11059200, while the sum is 58.

The square root of 1538686885 is about 39226.0995384451. The cubic root of 1538686885 is about 1154.4720349540.

The spelling of 1538686885 in words is "one billion, five hundred thirty-eight million, six hundred eighty-six thousand, eight hundred eighty-five".