16389390 has 32 divisors (see below), whose sum is σ = 40605696. Its totient is φ = 4229280.

The previous prime is 16389383. The next prime is 16389403. The reversal of 16389390 is 9398361.

16389390 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×16389390² = 537224209144200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7882 + ... + 9741.

It is an arithmetic number, because the mean of its divisors is an integer number (1268928).

Almost surely, 2^16389390 is an apocalyptic number.

16389390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16389390 is an abundant number, since it is smaller than the sum of its proper divisors (24216306).

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

16389390 is a wasteful number, since it uses less digits than its factorization.

16389390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17664.

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 16389390 is about 4048.3811579445. The cubic root of 16389390 is about 254.0120171221.

The spelling of 16389390 in words is "sixteen million, three hundred eighty-nine thousand, three hundred ninety".