40689090 has 96 divisors (see below), whose sum is σ = 115577280. Its totient is φ = 9871488.

The previous prime is 40689067. The next prime is 40689091. The reversal of 40689090 is 9098604.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40689091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96901 + ... + 97319.

It is an arithmetic number, because the mean of its divisors is an integer number (1203930).

Almost surely, 2^40689090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40689090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57788640).

40689090 is an abundant number, since it is smaller than the sum of its proper divisors (74888190).

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

40689090 is a wasteful number, since it uses less digits than its factorization.

40689090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 525 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 40689090 is about 6378.8000438954. The cubic root of 40689090 is about 343.9478975082.

The spelling of 40689090 in words is "forty million, six hundred eighty-nine thousand, ninety".