16561734 has 16 divisors (see below), whose sum is σ = 37855488. Its totient is φ = 4731912.

The previous prime is 16561717. The next prime is 16561763. The reversal of 16561734 is 43716561.

It is a junction number, because it is equal to n+sod(n) for n = 16561695 and 16561704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197122 + ... + 197205.

It is an arithmetic number, because the mean of its divisors is an integer number (2365968).

Almost surely, 2^16561734 is an apocalyptic number.

16561734 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

16561734 is an abundant number, since it is smaller than the sum of its proper divisors (21293754).

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

16561734 is a wasteful number, since it uses less digits than its factorization.

16561734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394339.

The product of its digits is 15120, while the sum is 33.

The square root of 16561734 is about 4069.6110379249. The cubic root of 16561734 is about 254.8992758674.

The spelling of 16561734 in words is "sixteen million, five hundred sixty-one thousand, seven hundred thirty-four".