42979394 has 4 divisors (see below), whose sum is σ = 64469094. Its totient is φ = 21489696.

The previous prime is 42979381. The next prime is 42979399. The reversal of 42979394 is 49397924.

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., 40768225 + 2211169 = 6385^2 + 1487^2 .

It is not an unprimeable number, because it can be changed into a prime (42979399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10744847 + ... + 10744850.

Almost surely, 2^42979394 is an apocalyptic number.

42979394 is a deficient number, since it is larger than the sum of its proper divisors (21489700).

42979394 is a wasteful number, since it uses less digits than its factorization.

42979394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21489699.

The product of its digits is 489888, while the sum is 47.

The square root of 42979394 is about 6555.8671432542. The cubic root of 42979394 is about 350.2838350658.

The spelling of 42979394 in words is "forty-two million, nine hundred seventy-nine thousand, three hundred ninety-four".