1986538475 has 24 divisors (see below), whose sum is σ = 2484007680. Its totient is φ = 1575936000.

The previous prime is 1986538459. The next prime is 1986538481. The reversal of 1986538475 is 5748356891.

It is not a de Polignac number, because 1986538475 - 2⁴ = 1986538459 is a prime.

It is a super-2 number, since 2×1986538475² = 7892670225310651250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1986538475.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2582891 + ... + 2583659.

It is an arithmetic number, because the mean of its divisors is an integer number (103500320).

Almost surely, 2^1986538475 is an apocalyptic number.

1986538475 is a deficient number, since it is larger than the sum of its proper divisors (497469205).

1986538475 is a wasteful number, since it uses less digits than its factorization.

1986538475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1511 (or 1506 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 56.

The square root of 1986538475 is about 44570.6010168138. The cubic root of 1986538475 is about 1257.0879409090.

The spelling of 1986538475 in words is "one billion, nine hundred eighty-six million, five hundred thirty-eight thousand, four hundred seventy-five".