42115642 has 4 divisors (see below), whose sum is σ = 63173466. Its totient is φ = 21057820.

The previous prime is 42115637. The next prime is 42115643. The reversal of 42115642 is 24651124.

It is a happy number.

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., 32387481 + 9728161 = 5691^2 + 3119^2 .

It is not an unprimeable number, because it can be changed into a prime (42115643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10528909 + ... + 10528912.

Almost surely, 2^42115642 is an apocalyptic number.

42115642 is a deficient number, since it is larger than the sum of its proper divisors (21057824).

42115642 is a wasteful number, since it uses less digits than its factorization.

42115642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21057823.

The product of its digits is 1920, while the sum is 25.

The square root of 42115642 is about 6489.6565394480. The cubic root of 42115642 is about 347.9213996527.

Adding to 42115642 its reverse (24651124), we get a palindrome (66766766).

The spelling of 42115642 in words is "forty-two million, one hundred fifteen thousand, six hundred forty-two".