42977845 has 8 divisors (see below), whose sum is σ = 51666264. Its totient is φ = 34320384.

The previous prime is 42977839. The next prime is 42977863. The reversal of 42977845 is 54877924.

It can be written as a sum of positive squares in 4 ways, for example, as 27783441 + 15194404 = 5271^2 + 3898^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42977845 - 2⁵ = 42977813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42977795 and 42977804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4564 + ... + 10333.

It is an arithmetic number, because the mean of its divisors is an integer number (6458283).

Almost surely, 2^42977845 is an apocalyptic number.

It is an amenable number.

42977845 is a deficient number, since it is larger than the sum of its proper divisors (8688419).

42977845 is a wasteful number, since it uses less digits than its factorization.

42977845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15479.

The product of its digits is 564480, while the sum is 46.

The square root of 42977845 is about 6555.7490037371. The cubic root of 42977845 is about 350.2796268772.

The spelling of 42977845 in words is "forty-two million, nine hundred seventy-seven thousand, eight hundred forty-five".