40008438 has 16 divisors (see below), whose sum is σ = 88907760. Its totient is φ = 13336128.

The previous prime is 40008427. The next prime is 40008439. The reversal of 40008438 is 83480004.

It is a super-2 number, since 2×40008438² = 3201350222399688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40008439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370395 + ... + 370502.

It is an arithmetic number, because the mean of its divisors is an integer number (5556735).

Almost surely, 2^40008438 is an apocalyptic number.

40008438 is an abundant number, since it is smaller than the sum of its proper divisors (48899322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40008438 is a wasteful number, since it uses less digits than its factorization.

40008438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740908 (or 740902 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 40008438 is about 6325.2223676326. Note that the first 3 decimals coincide. The cubic root of 40008438 is about 342.0192356063.

The spelling of 40008438 in words is "forty million, eight thousand, four hundred thirty-eight".