1986820379 has 12 divisors (see below), whose sum is σ = 2112317184. Its totient is φ = 1868398464.

The previous prime is 1986820373. The next prime is 1986820387. The reversal of 1986820379 is 9730286891.

It is not a de Polignac number, because 1986820379 - 2¹² = 1986816283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1986820379.

It is not an unprimeable number, because it can be changed into a prime (1986820373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 498854 + ... + 502820.

It is an arithmetic number, because the mean of its divisors is an integer number (176026432).

Almost surely, 2^1986820379 is an apocalyptic number.

1986820379 is a deficient number, since it is larger than the sum of its proper divisors (125496805).

1986820379 is a wasteful number, since it uses less digits than its factorization.

1986820379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734 (or 5717 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 1986820379 is about 44573.7633479606. The cubic root of 1986820379 is about 1257.1474013493.

The spelling of 1986820379 in words is "one billion, nine hundred eighty-six million, eight hundred twenty thousand, three hundred seventy-nine".