40069440 has 84 divisors (see below), whose sum is σ = 137832084. Its totient is φ = 10684416.

The previous prime is 40069429. The next prime is 40069441. The reversal of 40069440 is 4496004.

It can be written as a sum of positive squares in 2 ways, for example, as 20142144 + 19927296 = 4488^2 + 4464^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40069441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4077 + ... + 9836.

Almost surely, 2^40069440 is an apocalyptic number.

40069440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40069440 is an abundant number, since it is smaller than the sum of its proper divisors (97762644).

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

40069440 is a wasteful number, since it uses less digits than its factorization.

40069440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13936 (or 13923 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 40069440 is about 6330.0426538847. The cubic root of 40069440 is about 342.1929761431.

The spelling of 40069440 in words is "forty million, sixty-nine thousand, four hundred forty".