42378390 has 80 divisors (see below), whose sum is σ = 115207488. Its totient is φ = 11176704.

The previous prime is 42378373. The next prime is 42378407. The reversal of 42378390 is 9387324.

It is an interprime number because it is at equal distance from previous prime (42378373) and next prime (42378407).

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 91299 + ... + 91761.

Almost surely, 2^42378390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42378390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57603744).

42378390 is an abundant number, since it is smaller than the sum of its proper divisors (72829098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42378390 is a wasteful number, since it uses less digits than its factorization.

42378390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 42378390 is about 6509.8686622696. The cubic root of 42378390 is about 348.6434291093.

The spelling of 42378390 in words is "forty-two million, three hundred seventy-eight thousand, three hundred ninety".