1866122147 has 8 divisors (see below), whose sum is σ = 1978988112. Its totient is φ = 1753600000.

The previous prime is 1866122129. The next prime is 1866122161. The reversal of 1866122147 is 7412216681.

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 1866122147 - 2¹⁶ = 1866056611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1866122147.

It is not an unprimeable number, because it can be changed into a prime (1866122177) 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, 74729 + ... + 96522.

It is an arithmetic number, because the mean of its divisors is an integer number (247373514).

Almost surely, 2^1866122147 is an apocalyptic number.

1866122147 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1866122147 is a deficient number, since it is larger than the sum of its proper divisors (112865965).

1866122147 is a wasteful number, since it uses less digits than its factorization.

1866122147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171909.

The product of its digits is 32256, while the sum is 38.

The square root of 1866122147 is about 43198.6359391127. The cubic root of 1866122147 is about 1231.1567646785.

The spelling of 1866122147 in words is "one billion, eight hundred sixty-six million, one hundred twenty-two thousand, one hundred forty-seven".