42994538 has 4 divisors (see below), whose sum is σ = 64491810. Its totient is φ = 21497268.

The previous prime is 42994537. The next prime is 42994541. The reversal of 42994538 is 83549924.

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., 42994249 + 289 = 6557^2 + 17^2 .

It is not an unprimeable number, because it can be changed into a prime (42994531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10748633 + ... + 10748636.

Almost surely, 2^42994538 is an apocalyptic number.

42994538 is a deficient number, since it is larger than the sum of its proper divisors (21497272).

42994538 is a wasteful number, since it uses less digits than its factorization.

42994538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21497271.

The product of its digits is 311040, while the sum is 44.

The square root of 42994538 is about 6557.0220374801. The cubic root of 42994538 is about 350.3249716429.

The spelling of 42994538 in words is "forty-two million, nine hundred ninety-four thousand, five hundred thirty-eight".