42387242 has 4 divisors (see below), whose sum is σ = 63580866. Its totient is φ = 21193620.

The previous prime is 42387217. The next prime is 42387287. The reversal of 42387242 is 24278324.

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

It can be written as a sum of positive squares in only one way, i.e., 24990001 + 17397241 = 4999^2 + 4171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42387199 and 42387208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10596809 + ... + 10596812.

Almost surely, 2^42387242 is an apocalyptic number.

42387242 is a deficient number, since it is larger than the sum of its proper divisors (21193624).

42387242 is a wasteful number, since it uses less digits than its factorization.

42387242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21193623.

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

The square root of 42387242 is about 6510.5485175982. The cubic root of 42387242 is about 348.6677023043.

The spelling of 42387242 in words is "forty-two million, three hundred eighty-seven thousand, two hundred forty-two".