16381905 has 8 divisors (see below), whose sum is σ = 26211072. Its totient is φ = 8737008.

The previous prime is 16381891. The next prime is 16381961. The reversal of 16381905 is 50918361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16381905 - 2⁸ = 16381649 is a prime.

It is a super-2 number, since 2×16381905² = 536733622858050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546049 + ... + 546078.

It is an arithmetic number, because the mean of its divisors is an integer number (3276384).

Almost surely, 2^16381905 is an apocalyptic number.

16381905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16381905 is a deficient number, since it is larger than the sum of its proper divisors (9829167).

16381905 is a wasteful number, since it uses less digits than its factorization.

16381905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092135.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 16381905 is about 4047.4566087853. The cubic root of 16381905 is about 253.9733423157.

The spelling of 16381905 in words is "sixteen million, three hundred eighty-one thousand, nine hundred five".