42072938 has 4 divisors (see below), whose sum is σ = 63109410. Its totient is φ = 21036468.

The previous prime is 42072931. The next prime is 42073027. The reversal of 42072938 is 83927024.

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., 40921609 + 1151329 = 6397^2 + 1073^2 .

It is a super-2 number, since 2×42072938² = 3540264223903688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42072898 and 42072907.

It is not an unprimeable number, because it can be changed into a prime (42072931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518233 + ... + 10518236.

Almost surely, 2^42072938 is an apocalyptic number.

42072938 is a deficient number, since it is larger than the sum of its proper divisors (21036472).

42072938 is a wasteful number, since it uses less digits than its factorization.

42072938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21036471.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 42072938 is about 6486.3655462824. The cubic root of 42072938 is about 347.8037659241.

The spelling of 42072938 in words is "forty-two million, seventy-two thousand, nine hundred thirty-eight".