1985445105 has 32 divisors (see below), whose sum is σ = 3632947968. Its totient is φ = 907027200.

The previous prime is 1985445097. The next prime is 1985445107. The reversal of 1985445105 is 5015445891.

It is not a de Polignac number, because 1985445105 - 2³ = 1985445097 is a prime.

It is a super-2 number, since 2×1985445105² = 7883984529936922050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1985445107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177375 + ... + 188235.

It is an arithmetic number, because the mean of its divisors is an integer number (113529624).

Almost surely, 2^1985445105 is an apocalyptic number.

1985445105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1985445105 is a deficient number, since it is larger than the sum of its proper divisors (1647502863).

1985445105 is a wasteful number, since it uses less digits than its factorization.

1985445105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12617.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 1985445105 is about 44558.3337323110. Note that the first 3 decimals coincide. The cubic root of 1985445105 is about 1256.8572692323.

The spelling of 1985445105 in words is "one billion, nine hundred eighty-five million, four hundred forty-five thousand, one hundred five".