1988105 has 16 divisors (see below), whose sum is σ = 2792064. Its totient is φ = 1330560.

The previous prime is 1988101. The next prime is 1988113. The reversal of 1988105 is 5018891.

It is a happy number.

It is not a de Polignac number, because 1988105 - 2² = 1988101 is a prime.

It is a super-2 number, since 2×1988105² = 7905122982050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 845 + ... + 2165.

It is an arithmetic number, because the mean of its divisors is an integer number (174504).

2^1988105 is an apocalyptic number.

It is an amenable number.

1988105 is a deficient number, since it is larger than the sum of its proper divisors (803959).

1988105 is a wasteful number, since it uses less digits than its factorization.

1988105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1988105 is about 1410.0017730485. The cubic root of 1988105 is about 125.7418288111.

The spelling of 1988105 in words is "one million, nine hundred eighty-eight thousand, one hundred five".