40909090 has 32 divisors (see below), whose sum is σ = 78120000. Its totient is φ = 15380928.

The previous prime is 40909081. The next prime is 40909097. The reversal of 40909090 is 9090904.

40909090 is a modest number, since divided by 9090 gives 4090 as remainder.

It is not an unprimeable number, because it can be changed into a prime (40909097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25636 + ... + 27184.

It is an arithmetic number, because the mean of its divisors is an integer number (2441250).

Almost surely, 2^40909090 is an apocalyptic number.

40909090 is a deficient number, since it is larger than the sum of its proper divisors (37210910).

40909090 is a wasteful number, since it uses less digits than its factorization.

40909090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 40909090 is about 6396.0214196014. The cubic root of 40909090 is about 344.5666757390.

Adding to 40909090 its reverse (9090904), we get a palindrome (49999994).

The spelling of 40909090 in words is "forty million, nine hundred nine thousand, ninety".