40020136 has 32 divisors (see below), whose sum is σ = 81849600. Its totient is φ = 18233280.

The previous prime is 40020131. The next prime is 40020151. The reversal of 40020136 is 63102004.

It is a super-2 number, since 2×40020136² = 3203222570916992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40020131) 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, 5781 + ... + 10651.

It is an arithmetic number, because the mean of its divisors is an integer number (2557800).

Almost surely, 2^40020136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40020136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40924800).

40020136 is an abundant number, since it is smaller than the sum of its proper divisors (41829464).

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

40020136 is a wasteful number, since it uses less digits than its factorization.

40020136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4969 (or 4965 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40020136 is about 6326.1470106219. The cubic root of 40020136 is about 342.0525665013.

The spelling of 40020136 in words is "forty million, twenty thousand, one hundred thirty-six".