42638390 has 16 divisors (see below), whose sum is σ = 78008400. Its totient is φ = 16775520.

The previous prime is 42638371. The next prime is 42638417. The reversal of 42638390 is 9383624.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42638390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34340 + ... + 35559.

It is an arithmetic number, because the mean of its divisors is an integer number (4875525).

Almost surely, 2^42638390 is an apocalyptic number.

42638390 is a deficient number, since it is larger than the sum of its proper divisors (35370010).

42638390 is a wasteful number, since it uses less digits than its factorization.

42638390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69967.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 42638390 is about 6529.8078072789. The cubic root of 42638390 is about 349.3549752615.

The spelling of 42638390 in words is "forty-two million, six hundred thirty-eight thousand, three hundred ninety".