42477779 has 4 divisors (see below), whose sum is σ = 43942560. Its totient is φ = 41013000.

The previous prime is 42477769. The next prime is 42477791. The reversal of 42477779 is 97777424.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42477779 - 2²⁰ = 41429203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42477769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732347 + ... + 732404.

It is an arithmetic number, because the mean of its divisors is an integer number (10985640).

Almost surely, 2^42477779 is an apocalyptic number.

42477779 is a deficient number, since it is larger than the sum of its proper divisors (1464781).

42477779 is a wasteful number, since it uses less digits than its factorization.

42477779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464780.

The product of its digits is 691488, while the sum is 47.

The square root of 42477779 is about 6517.4979094742. The cubic root of 42477779 is about 348.9157712791.

The spelling of 42477779 in words is "forty-two million, four hundred seventy-seven thousand, seven hundred seventy-nine".