989428238 has 4 divisors (see below), whose sum is σ = 1484142360. Its totient is φ = 494714118.

The previous prime is 989428217. The next prime is 989428241. The reversal of 989428238 is 832824989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 832824989 = 43 ⋅19368023.

It is a self number, because there is not a number n which added to its sum of digits gives 989428238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247357058 + ... + 247357061.

It is an arithmetic number, because the mean of its divisors is an integer number (371035590).

Almost surely, 2^989428238 is an apocalyptic number.

989428238 is the 16814-th centered heptagonal number.

989428238 is a deficient number, since it is larger than the sum of its proper divisors (494714122).

989428238 is a wasteful number, since it uses less digits than its factorization.

989428238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494714121.

The product of its digits is 1990656, while the sum is 53.

The square root of 989428238 is about 31455.1782382488. The cubic root of 989428238 is about 996.4635878649.

The spelling of 989428238 in words is "nine hundred eighty-nine million, four hundred twenty-eight thousand, two hundred thirty-eight".