42977989 has 8 divisors (see below), whose sum is σ = 45581400. Its totient is φ = 40382976.

The previous prime is 42977983. The next prime is 42977993. The reversal of 42977989 is 98977924.

It can be written as a sum of positive squares in 4 ways, for example, as 9972964 + 33005025 = 3158^2 + 5745^2 .

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 42977989 - 2¹⁷ = 42846917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42977983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10737 + ... + 14185.

It is an arithmetic number, because the mean of its divisors is an integer number (5697675).

Almost surely, 2^42977989 is an apocalyptic number.

It is an amenable number.

42977989 is a deficient number, since it is larger than the sum of its proper divisors (2603411).

42977989 is a wasteful number, since it uses less digits than its factorization.

42977989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199.

The product of its digits is 2286144, while the sum is 55.

The square root of 42977989 is about 6555.7599864547. The cubic root of 42977989 is about 350.2800180882.

The spelling of 42977989 in words is "forty-two million, nine hundred seventy-seven thousand, nine hundred eighty-nine".