40842090 has 64 divisors (see below), whose sum is σ = 109480320. Its totient is φ = 10834560.

The previous prime is 40842073. The next prime is 40842127. The reversal of 40842090 is 9024804.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89142 + ... + 89598.

It is an arithmetic number, because the mean of its divisors is an integer number (1710630).

Almost surely, 2^40842090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40842090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54740160).

40842090 is an abundant number, since it is smaller than the sum of its proper divisors (68638230).

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

40842090 is a wasteful number, since it uses less digits than its factorization.

40842090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804 (or 798 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 40842090 is about 6390.7816423345. The cubic root of 40842090 is about 344.3784650668.

Adding to 40842090 its reverse (9024804), we get a palindrome (49866894).

The spelling of 40842090 in words is "forty million, eight hundred forty-two thousand, ninety".