988538869 has 4 divisors (see below), whose sum is σ = 989877280. Its totient is φ = 987200460.

The previous prime is 988538857. The next prime is 988538891. The reversal of 988538869 is 968835889.

988538869 = T₂₅₆₇₀ + T₂₅₆₇₁ + T₂₅₆₇₂.

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 988538869 - 2¹³ = 988530677 is a prime.

It is a super-2 number, since 2×988538869² = 1954418191047598322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 988538869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988538839) 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, 668097 + ... + 669574.

It is an arithmetic number, because the mean of its divisors is an integer number (247469320).

Almost surely, 2^988538869 is an apocalyptic number.

988538869 is the 25672-nd centered triangular number.

It is an amenable number.

988538869 is a deficient number, since it is larger than the sum of its proper divisors (1338411).

988538869 is a wasteful number, since it uses less digits than its factorization.

988538869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338410.

The product of its digits is 29859840, while the sum is 64.

The square root of 988538869 is about 31441.0379758684. The cubic root of 988538869 is about 996.1649340710.

The spelling of 988538869 in words is "nine hundred eighty-eight million, five hundred thirty-eight thousand, eight hundred sixty-nine".