42378404 has 12 divisors (see below), whose sum is σ = 74471628. Its totient is φ = 21100800.

The previous prime is 42378373. The next prime is 42378407. The reversal of 42378404 is 40487324.

It can be written as a sum of positive squares in 2 ways, for example, as 33616804 + 8761600 = 5798^2 + 2960^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (42378407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21017 + ... + 22944.

It is an arithmetic number, because the mean of its divisors is an integer number (6205969).

Almost surely, 2^42378404 is an apocalyptic number.

It is an amenable number.

42378404 is a deficient number, since it is larger than the sum of its proper divisors (32093224).

42378404 is a wasteful number, since it uses less digits than its factorization.

42378404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44206 (or 44204 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 42378404 is about 6509.8697375600. The cubic root of 42378404 is about 348.6434675016.

The spelling of 42378404 in words is "forty-two million, three hundred seventy-eight thousand, four hundred four".