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161388 = 22324483
BaseRepresentation
bin100111011001101100
322012101100
4213121230
520131023
63243100
71241343
oct473154
9265340
10161388
11100287
1279490
13585c6
1442b5a
1532c43
hex2766c

161388 has 18 divisors (see below), whose sum is σ = 408044. Its totient is φ = 53784.

The previous prime is 161387. The next prime is 161407. The reversal of 161388 is 883161.

It is a tau number, because it is divible by the number of its divisors (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161388.

It is not an unprimeable number, because it can be changed into a prime (161387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2206 + ... + 2277.

2161388 is an apocalyptic number.

161388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161388 is an abundant number, since it is smaller than the sum of its proper divisors (246656).

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

161388 is a wasteful number, since it uses less digits than its factorization.

161388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493 (or 4488 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 161388 is about 401.7312534519. The cubic root of 161388 is about 54.4448843810. Note that the first 3 decimals are identical.

The spelling of 161388 in words is "one hundred sixty-one thousand, three hundred eighty-eight".

Divisors: 1 2 3 4 6 9 12 18 36 4483 8966 13449 17932 26898 40347 53796 80694 161388