40309442 has 8 divisors (see below), whose sum is σ = 60545100. Its totient is φ = 20127744.

The previous prime is 40309439. The next prime is 40309453. The reversal of 40309442 is 24490304.

It can be written as a sum of positive squares in 2 ways, for example, as 39702601 + 606841 = 6301^2 + 779^2 .

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

It is a super-2 number, since 2×40309442² = 3249702228702728, which contains 22 as substring.

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, 11567 + ... + 14642.

Almost surely, 2^40309442 is an apocalyptic number.

40309442 is a deficient number, since it is larger than the sum of its proper divisors (20235658).

40309442 is a wasteful number, since it uses less digits than its factorization.

40309442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26980.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 40309442 is about 6348.9717277682. The cubic root of 40309442 is about 342.8748222200.

Adding to 40309442 its reverse (24490304), we get a palindrome (64799746).

The spelling of 40309442 in words is "forty million, three hundred nine thousand, four hundred forty-two".