988493509 has 16 divisors (see below), whose sum is σ = 1057148928. Its totient is φ = 921053952.

The previous prime is 988493501. The next prime is 988493537. The reversal of 988493509 is 905394889.

It is a cyclic number.

It is not a de Polignac number, because 988493509 - 2³ = 988493501 is a prime.

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 988493509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988493501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1021744 + ... + 1022710.

It is an arithmetic number, because the mean of its divisors is an integer number (66071808).

Almost surely, 2^988493509 is an apocalyptic number.

It is an amenable number.

988493509 is a deficient number, since it is larger than the sum of its proper divisors (68655419).

988493509 is a wasteful number, since it uses less digits than its factorization.

988493509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 988493509 is about 31440.3166173625. The cubic root of 988493509 is about 996.1496971950.

The spelling of 988493509 in words is "nine hundred eighty-eight million, four hundred ninety-three thousand, five hundred nine".