42743989 has 4 divisors (see below), whose sum is σ = 42773440. Its totient is φ = 42714540.

The previous prime is 42743969. The next prime is 42744007. The reversal of 42743989 is 98934724.

It is a happy number.

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 42743989 - 2⁵ = 42743957 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 (42743929) 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, 12429 + ... + 15490.

It is an arithmetic number, because the mean of its divisors is an integer number (10693360).

Almost surely, 2^42743989 is an apocalyptic number.

It is an amenable number.

42743989 is a deficient number, since it is larger than the sum of its proper divisors (29451).

42743989 is a wasteful number, since it uses less digits than its factorization.

42743989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29450.

The product of its digits is 435456, while the sum is 46.

The square root of 42743989 is about 6537.8887264927. Note that the first 3 decimals coincide. The cubic root of 42743989 is about 349.6431437599.

The spelling of 42743989 in words is "forty-two million, seven hundred forty-three thousand, nine hundred eighty-nine".