1986868451 has 8 divisors (see below), whose sum is σ = 2028905664. Its totient is φ = 1945195560.

The previous prime is 1986868447. The next prime is 1986868493. The reversal of 1986868451 is 1548686891.

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 1986868451 - 2² = 1986868447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986868951) 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, 80045 + ... + 101886.

It is an arithmetic number, because the mean of its divisors is an integer number (253613208).

Almost surely, 2^1986868451 is an apocalyptic number.

1986868451 is a deficient number, since it is larger than the sum of its proper divisors (42037213).

1986868451 is a wasteful number, since it uses less digits than its factorization.

1986868451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182161.

The product of its digits is 3317760, while the sum is 56.

The square root of 1986868451 is about 44574.3025856827. The cubic root of 1986868451 is about 1257.1575403471.

The spelling of 1986868451 in words is "one billion, nine hundred eighty-six million, eight hundred sixty-eight thousand, four hundred fifty-one".