42120577 has 4 divisors (see below), whose sum is σ = 44598276. Its totient is φ = 39642880.

The previous prime is 42120569. The next prime is 42120581. The reversal of 42120577 is 77502124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32160241 + 9960336 = 5671^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 42120577 - 2³ = 42120569 is a prime.

It is a super-4 number, since 4×42120577⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (42120517) 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, 1238824 + ... + 1238857.

It is an arithmetic number, because the mean of its divisors is an integer number (11149569).

Almost surely, 2^42120577 is an apocalyptic number.

It is an amenable number.

42120577 is a deficient number, since it is larger than the sum of its proper divisors (2477699).

42120577 is a wasteful number, since it uses less digits than its factorization.

42120577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2477698.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 42120577 is about 6490.0367487403. The cubic root of 42120577 is about 347.9349886264.

The spelling of 42120577 in words is "forty-two million, one hundred twenty thousand, five hundred seventy-seven".