40165406 has 16 divisors (see below), whose sum is σ = 65037600. Its totient is φ = 18546528.

The previous prime is 40165393. The next prime is 40165409. The reversal of 40165406 is 60456104.

It is a happy number.

It is a super-2 number, since 2×40165406² = 3226519678289672, 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 (40165409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13721 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (4064850).

Almost surely, 2^40165406 is an apocalyptic number.

40165406 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

40165406 is a deficient number, since it is larger than the sum of its proper divisors (24872194).

40165406 is a wasteful number, since it uses less digits than its factorization.

40165406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30163.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 40165406 is about 6337.6183223668. The cubic root of 40165406 is about 342.4659415225.

The spelling of 40165406 in words is "forty million, one hundred sixty-five thousand, four hundred six".