16389140 has 12 divisors (see below), whose sum is σ = 34417236. Its totient is φ = 6555648.

The previous prime is 16389127. The next prime is 16389151. The reversal of 16389140 is 4198361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11062276 + 5326864 = 3326^2 + 2308^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16389097 and 16389106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409709 + ... + 409748.

It is an arithmetic number, because the mean of its divisors is an integer number (2868103).

Almost surely, 2^16389140 is an apocalyptic number.

16389140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16389140 is an abundant number, since it is smaller than the sum of its proper divisors (18028096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16389140 is a wasteful number, since it uses less digits than its factorization.

16389140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819466 (or 819464 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 16389140 is about 4048.3502812874. The cubic root of 16389140 is about 254.0107255685.

The spelling of 16389140 in words is "sixteen million, three hundred eighty-nine thousand, one hundred forty".