42390398 has 4 divisors (see below), whose sum is σ = 63585600. Its totient is φ = 21195198.

The previous prime is 42390391. The next prime is 42390437. The reversal of 42390398 is 89309324.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42390391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597598 + ... + 10597601.

It is an arithmetic number, because the mean of its divisors is an integer number (15896400).

Almost surely, 2^42390398 is an apocalyptic number.

42390398 is a deficient number, since it is larger than the sum of its proper divisors (21195202).

42390398 is a wasteful number, since it uses less digits than its factorization.

42390398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21195201.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 42390398 is about 6510.7908889781. The cubic root of 42390398 is about 348.6763555996.

The spelling of 42390398 in words is "forty-two million, three hundred ninety thousand, three hundred ninety-eight".