42388138 has 16 divisors (see below), whose sum is σ = 69105960. Its totient is φ = 19382976.

The previous prime is 42388117. The next prime is 42388217. The reversal of 42388138 is 83188324.

It can be written as a sum of positive squares in 4 ways, for example, as 28227969 + 14160169 = 5313^2 + 3763^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42388097 and 42388106.

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, 4645 + ... + 10312.

Almost surely, 2^42388138 is an apocalyptic number.

42388138 is a deficient number, since it is larger than the sum of its proper divisors (26717822).

42388138 is a wasteful number, since it uses less digits than its factorization.

42388138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15081.

The product of its digits is 36864, while the sum is 37.

The square root of 42388138 is about 6510.6173286410. The cubic root of 42388138 is about 348.6701590503.

The spelling of 42388138 in words is "forty-two million, three hundred eighty-eight thousand, one hundred thirty-eight".