40309090 has 8 divisors (see below), whose sum is σ = 72556380. Its totient is φ = 16123632.

The previous prime is 40309081. The next prime is 40309117. The reversal of 40309090 is 9090304.

It can be written as a sum of positive squares in 2 ways, for example, as 40081561 + 227529 = 6331^2 + 477^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

40309090 is a modest number, since divided by 9090 gives 4030 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2015445 + ... + 2015464.

Almost surely, 2^40309090 is an apocalyptic number.

40309090 is a deficient number, since it is larger than the sum of its proper divisors (32247290).

40309090 is a wasteful number, since it uses less digits than its factorization.

40309090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030916.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 40309090 is about 6348.9440066833. The cubic root of 40309090 is about 342.8738241718.

Adding to 40309090 its reverse (9090304), we get a palindrome (49399394).

The spelling of 40309090 in words is "forty million, three hundred nine thousand, ninety".