16861487 has 4 divisors (see below), whose sum is σ = 16916016. Its totient is φ = 16806960.

The previous prime is 16861483. The next prime is 16861517. The reversal of 16861487 is 78416861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16861487 - 2² = 16861483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26798 + ... + 27419.

It is an arithmetic number, because the mean of its divisors is an integer number (4229004).

Almost surely, 2^16861487 is an apocalyptic number.

16861487 is a deficient number, since it is larger than the sum of its proper divisors (54529).

16861487 is an equidigital number, since it uses as much as digits as its factorization.

16861487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54528.

The product of its digits is 64512, while the sum is 41.

The square root of 16861487 is about 4106.2741019080. The cubic root of 16861487 is about 256.4279088149.

The spelling of 16861487 in words is "sixteen million, eight hundred sixty-one thousand, four hundred eighty-seven".