10781985 has 16 divisors (see below), whose sum is σ = 17718336. Its totient is φ = 5594688.

The previous prime is 10781983. The next prime is 10781993. The reversal of 10781985 is 58918701.

It is not a de Polignac number, because 10781985 - 2¹ = 10781983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10781983) 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, 9159 + ... + 10268.

It is an arithmetic number, because the mean of its divisors is an integer number (1107396).

Almost surely, 2^10781985 is an apocalyptic number.

10781985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10781985 is a deficient number, since it is larger than the sum of its proper divisors (6936351).

10781985 is a wasteful number, since it uses less digits than its factorization.

10781985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19472.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 10781985 is about 3283.5933061206. The cubic root of 10781985 is about 220.9189181343.

The spelling of 10781985 in words is "ten million, seven hundred eighty-one thousand, nine hundred eighty-five".