1985538 has 16 divisors (see below), whose sum is σ = 4180320. Its totient is φ = 626976.

The previous prime is 1985537. The next prime is 1985551. The reversal of 1985538 is 8355891.

It is a super-2 number, since 2×1985538² = 7884722298888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1985496 and 1985505.

It is not an unprimeable number, because it can be changed into a prime (1985537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8595 + ... + 8822.

It is an arithmetic number, because the mean of its divisors is an integer number (261270).

2^1985538 is an apocalyptic number.

1985538 is an abundant number, since it is smaller than the sum of its proper divisors (2194782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985538 is a wasteful number, since it uses less digits than its factorization.

1985538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17441.

The product of its digits is 43200, while the sum is 39.

The square root of 1985538 is about 1409.0911964809. The cubic root of 1985538 is about 125.6876870871.

The spelling of 1985538 in words is "one million, nine hundred eighty-five thousand, five hundred thirty-eight".