40091940 has 144 divisors (see below), whose sum is σ = 142152192. Its totient is φ = 8955648.

The previous prime is 40091927. The next prime is 40091963. The reversal of 40091940 is 4919004.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58882 + ... + 59558.

It is an arithmetic number, because the mean of its divisors is an integer number (987168).

Almost surely, 2^40091940 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 40091940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71076096).

40091940 is an abundant number, since it is smaller than the sum of its proper divisors (102060252).

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

40091940 is a wasteful number, since it uses less digits than its factorization.

40091940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 741 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 40091940 is about 6331.8196436727. The cubic root of 40091940 is about 342.2570141505.

The spelling of 40091940 in words is "forty million, ninety-one thousand, nine hundred forty".