40017838 has 64 divisors (see below), whose sum is σ = 78151680. Its totient is φ = 14968800.

The previous prime is 40017829. The next prime is 40017839. The reversal of 40017838 is 83871004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40017839) 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, 189553 + ... + 189763.

It is an arithmetic number, because the mean of its divisors is an integer number (1221120).

Almost surely, 2^40017838 is an apocalyptic number.

40017838 is a deficient number, since it is larger than the sum of its proper divisors (38133842).

40017838 is a wasteful number, since it uses less digits than its factorization.

40017838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 40017838 is about 6325.9653808727. The cubic root of 40017838 is about 342.0460193651.

The spelling of 40017838 in words is "forty million, seventeen thousand, eight hundred thirty-eight".