1986422774 has 64 divisors (see below), whose sum is σ = 3648233472. Its totient is φ = 793152000.

The previous prime is 1986422771. The next prime is 1986422777. The reversal of 1986422774 is 4772246891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1986422771) and next prime (1986422777).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986422771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1653374 + ... + 1654574.

It is an arithmetic number, because the mean of its divisors is an integer number (57003648).

Almost surely, 2^1986422774 is an apocalyptic number.

1986422774 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1986422774 is a deficient number, since it is larger than the sum of its proper divisors (1661810698).

1986422774 is a wasteful number, since it uses less digits than its factorization.

1986422774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its digits is 1354752, while the sum is 50.

The square root of 1986422774 is about 44569.3030459306. The cubic root of 1986422774 is about 1257.0635351134.

The spelling of 1986422774 in words is "one billion, nine hundred eighty-six million, four hundred twenty-two thousand, seven hundred seventy-four".