16988493 has 4 divisors (see below), whose sum is σ = 22651328. Its totient is φ = 11325660.

The previous prime is 16988399. The next prime is 16988501. The reversal of 16988493 is 39488961.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39488961 = 3 ⋅13162987.

It is not a de Polignac number, because 16988493 - 2¹⁰ = 16987469 is a prime.

It is a super-2 number, since 2×16988493² = 577217788822098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16988393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831413 + ... + 2831418.

It is an arithmetic number, because the mean of its divisors is an integer number (5662832).

Almost surely, 2^16988493 is an apocalyptic number.

It is an amenable number.

16988493 is a deficient number, since it is larger than the sum of its proper divisors (5662835).

16988493 is an equidigital number, since it uses as much as digits as its factorization.

16988493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662834.

The product of its digits is 373248, while the sum is 48.

The square root of 16988493 is about 4121.7099606838. The cubic root of 16988493 is about 257.0701308000.

The spelling of 16988493 in words is "sixteen million, nine hundred eighty-eight thousand, four hundred ninety-three".