1986227478 has 12 divisors (see below), whose sum is σ = 4303492908. Its totient is φ = 662075820.

The previous prime is 1986227461. The next prime is 1986227479. The reversal of 1986227478 is 8747226891.

It is a happy number.

1986227478 is a `hidden beast` number, since 1 + 9 + 8 + 622 + 7 + 4 + 7 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986227479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55172968 + ... + 55173003.

It is an arithmetic number, because the mean of its divisors is an integer number (358624409).

Almost surely, 2^1986227478 is an apocalyptic number.

1986227478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1986227478 is an abundant number, since it is smaller than the sum of its proper divisors (2317265430).

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

1986227478 is a wasteful number, since it uses less digits than its factorization.

1986227478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110345979 (or 110345976 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 1986227478 is about 44567.1120670837. The cubic root of 1986227478 is about 1257.0223375179.

The spelling of 1986227478 in words is "one billion, nine hundred eighty-six million, two hundred twenty-seven thousand, four hundred seventy-eight".