42897389 has 4 divisors (see below), whose sum is σ = 42943356. Its totient is φ = 42851424.

The previous prime is 42897347. The next prime is 42897431. The reversal of 42897389 is 98379824.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (42897347) and next prime (42897431).

It can be written as a sum of positive squares in 2 ways, for example, as 7590025 + 35307364 = 2755^2 + 5942^2 .

It is a cyclic number.

It is not a de Polignac number, because 42897389 - 2⁸ = 42897133 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 (42897329) 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, 21554 + ... + 23459.

It is an arithmetic number, because the mean of its divisors is an integer number (10735839).

Almost surely, 2^42897389 is an apocalyptic number.

It is an amenable number.

42897389 is a deficient number, since it is larger than the sum of its proper divisors (45967).

42897389 is an equidigital number, since it uses as much as digits as its factorization.

42897389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45966.

The product of its digits is 870912, while the sum is 50.

The square root of 42897389 is about 6549.6098357078. The cubic root of 42897389 is about 350.0609118476.

The spelling of 42897389 in words is "forty-two million, eight hundred ninety-seven thousand, three hundred eighty-nine".