40091240 has 64 divisors (see below), whose sum is σ = 103973760. Its totient is φ = 13628160.

The previous prime is 40091237. The next prime is 40091251. The reversal of 40091240 is 4219004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36134 + ... + 37226.

It is an arithmetic number, because the mean of its divisors is an integer number (1624590).

Almost surely, 2^40091240 is an apocalyptic number.

40091240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40091240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51986880).

40091240 is an abundant number, since it is smaller than the sum of its proper divisors (63882520).

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

40091240 is a wasteful number, since it uses less digits than its factorization.

40091240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 40091240 is about 6331.7643670623. The cubic root of 40091240 is about 342.2550222181.

The spelling of 40091240 in words is "forty million, ninety-one thousand, two hundred forty".