298078639 has 4 divisors (see below), whose sum is σ = 298113480. Its totient is φ = 298043800.

The previous prime is 298078633. The next prime is 298078691. The reversal of 298078639 is 936870892.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 298078639 - 2⁵ = 298078607 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 (298078633) 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, 5232 + ... + 24970.

It is an arithmetic number, because the mean of its divisors is an integer number (74528370).

Almost surely, 2^298078639 is an apocalyptic number.

298078639 is a deficient number, since it is larger than the sum of its proper divisors (34841).

298078639 is a wasteful number, since it uses less digits than its factorization.

298078639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34840.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The square root of 298078639 is about 17264.9540688645. The cubic root of 298078639 is about 668.0007522372. Note that the first 3 decimals are identical.

The spelling of 298078639 in words is "two hundred ninety-eight million, seventy-eight thousand, six hundred thirty-nine".