16861947 has 8 divisors (see below), whose sum is σ = 23031120. Its totient is φ = 10967040.

The previous prime is 16861939. The next prime is 16861981. The reversal of 16861947 is 74916861.

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

It is not a de Polignac number, because 16861947 - 2³ = 16861939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16861899 and 16861908.

It is not an unprimeable number, because it can be changed into a prime (16861937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68422 + ... + 68667.

It is an arithmetic number, because the mean of its divisors is an integer number (2878890).

Almost surely, 2^16861947 is an apocalyptic number.

16861947 is a deficient number, since it is larger than the sum of its proper divisors (6169173).

16861947 is a wasteful number, since it uses less digits than its factorization.

16861947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137133.

The product of its digits is 72576, while the sum is 42.

The square root of 16861947 is about 4106.3301133737. The cubic root of 16861947 is about 256.4302406726.

The spelling of 16861947 in words is "sixteen million, eight hundred sixty-one thousand, nine hundred forty-seven".