42940778 has 4 divisors (see below), whose sum is σ = 64411170. Its totient is φ = 21470388.

The previous prime is 42940721. The next prime is 42940823. The reversal of 42940778 is 87704924.

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., 23164969 + 19775809 = 4813^2 + 4447^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10735193 + ... + 10735196.

Almost surely, 2^42940778 is an apocalyptic number.

42940778 is a deficient number, since it is larger than the sum of its proper divisors (21470392).

42940778 is a wasteful number, since it uses less digits than its factorization.

42940778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21470391.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 42940778 is about 6552.9213332681. The cubic root of 42940778 is about 350.1788962998.

The spelling of 42940778 in words is "forty-two million, nine hundred forty thousand, seven hundred seventy-eight".