1861400214 has 24 divisors (see below), whose sum is σ = 4042408032. Its totient is φ = 619024560.

The previous prime is 1861400207. The next prime is 1861400243. The reversal of 1861400214 is 4120041681.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112209 + ... + 127724.

It is an arithmetic number, because the mean of its divisors is an integer number (168433668).

Almost surely, 2^1861400214 is an apocalyptic number.

1861400214 is an abundant number, since it is smaller than the sum of its proper divisors (2181007818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861400214 is a wasteful number, since it uses less digits than its factorization.

1861400214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240372 (or 240369 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1861400214 is about 43143.9475940716. The cubic root of 1861400214 is about 1230.1174704384.

Adding to 1861400214 its reverse (4120041681), we get a palindrome (5981441895).

The spelling of 1861400214 in words is "one billion, eight hundred sixty-one million, four hundred thousand, two hundred fourteen".