16861945 has 8 divisors (see below), whose sum is σ = 20257344. Its totient is φ = 13474224.

The previous prime is 16861939. The next prime is 16861981. The reversal of 16861945 is 54916861.

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

It is a cyclic number.

It is not a de Polignac number, because 16861945 - 2³ = 16861937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16861898 and 16861907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5602 + ... + 8068.

It is an arithmetic number, because the mean of its divisors is an integer number (2532168).

Almost surely, 2^16861945 is an apocalyptic number.

It is an amenable number.

16861945 is a deficient number, since it is larger than the sum of its proper divisors (3395399).

16861945 is a wasteful number, since it uses less digits than its factorization.

16861945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839.

The product of its digits is 51840, while the sum is 40.

The square root of 16861945 is about 4106.3298698473. The cubic root of 16861945 is about 256.4302305342.

The spelling of 16861945 in words is "sixteen million, eight hundred sixty-one thousand, nine hundred forty-five".