16861869 has 6 divisors (see below), whose sum is σ = 24356046. Its totient is φ = 11241240.

The previous prime is 16861837. The next prime is 16861877. The reversal of 16861869 is 96816861.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 580644 = 4035^2 + 762^2 .

It is not a de Polignac number, because 16861869 - 2⁵ = 16861837 is a prime.

It is a super-2 number, since 2×16861869² = 568645252346322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861879) 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, 936762 + ... + 936779.

It is an arithmetic number, because the mean of its divisors is an integer number (4059341).

Almost surely, 2^16861869 is an apocalyptic number.

It is an amenable number.

16861869 is a deficient number, since it is larger than the sum of its proper divisors (7494177).

16861869 is a wasteful number, since it uses less digits than its factorization.

16861869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873547 (or 1873544 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 16861869 is about 4106.3206158312. The cubic root of 16861869 is about 256.4298452736.

The spelling of 16861869 in words is "sixteen million, eight hundred sixty-one thousand, eight hundred sixty-nine".