42779949 has 4 divisors (see below), whose sum is σ = 57039936. Its totient is φ = 28519964.

The previous prime is 42779941. The next prime is 42780013. The reversal of 42779949 is 94997724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42779949 - 2³ = 42779941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42779941) 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, 7129989 + ... + 7129994.

It is an arithmetic number, because the mean of its divisors is an integer number (14259984).

Almost surely, 2^42779949 is an apocalyptic number.

It is an amenable number.

42779949 is a deficient number, since it is larger than the sum of its proper divisors (14259987).

42779949 is a wasteful number, since it uses less digits than its factorization.

42779949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14259986.

The product of its digits is 1143072, while the sum is 51.

The square root of 42779949 is about 6540.6382716062. The cubic root of 42779949 is about 349.7411664566.

The spelling of 42779949 in words is "forty-two million, seven hundred seventy-nine thousand, nine hundred forty-nine".