404140342 has 4 divisors (see below), whose sum is σ = 606210516. Its totient is φ = 202070170.

The previous prime is 404140277. The next prime is 404140349. The reversal of 404140342 is 243041404.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404140349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101035084 + ... + 101035087.

It is an arithmetic number, because the mean of its divisors is an integer number (151552629).

Almost surely, 2^404140342 is an apocalyptic number.

404140342 is a deficient number, since it is larger than the sum of its proper divisors (202070174).

404140342 is a wasteful number, since it uses less digits than its factorization.

404140342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202070173.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 404140342 is about 20103.2420768392. The cubic root of 404140342 is about 739.3397702596.

Adding to 404140342 its reverse (243041404), we get a palindrome (647181746).

The spelling of 404140342 in words is "four hundred four million, one hundred forty thousand, three hundred forty-two".