10406781 has 24 divisors (see below), whose sum is σ = 18742464. Its totient is φ = 5405760.

The previous prime is 10406779. The next prime is 10406797. The reversal of 10406781 is 18760401.

It is a happy number.

It is not a de Polignac number, because 10406781 - 2¹ = 10406779 is a prime.

It is a super-2 number, since 2×10406781² = 216602181563922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10406381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6816 + ... + 8201.

It is an arithmetic number, because the mean of its divisors is an integer number (780936).

Almost surely, 2^10406781 is an apocalyptic number.

10406781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10406781 is a deficient number, since it is larger than the sum of its proper divisors (8335683).

10406781 is a wasteful number, since it uses less digits than its factorization.

10406781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15041 (or 15038 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 10406781 is about 3225.9542774193. The cubic root of 10406781 is about 218.3260069151.

The spelling of 10406781 in words is "ten million, four hundred six thousand, seven hundred eighty-one".