42390164 has 12 divisors (see below), whose sum is σ = 74948244. Its totient is φ = 20976384.

The previous prime is 42390149. The next prime is 42390169. The reversal of 42390164 is 46109324.

It can be written as a sum of positive squares in 2 ways, for example, as 17808400 + 24581764 = 4220^2 + 4958^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42390169) by changing a digit.

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, 54239 + ... + 55014.

It is an arithmetic number, because the mean of its divisors is an integer number (6245687).

Almost surely, 2^42390164 is an apocalyptic number.

It is an amenable number.

42390164 is a deficient number, since it is larger than the sum of its proper divisors (32558080).

42390164 is a wasteful number, since it uses less digits than its factorization.

42390164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109354 (or 109352 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 42390164 is about 6510.7729187862. The cubic root of 42390164 is about 348.6757140202.

Adding to 42390164 its reverse (46109324), we get a palindrome (88499488).

The spelling of 42390164 in words is "forty-two million, three hundred ninety thousand, one hundred sixty-four".