1966945380 has 48 divisors (see below), whose sum is σ = 5511105600. Its totient is φ = 524170368.

The previous prime is 1966945333. The next prime is 1966945391. The reversal of 1966945380 is 835496691.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87546 + ... + 107694.

It is an arithmetic number, because the mean of its divisors is an integer number (114814700).

Almost surely, 2^1966945380 is an apocalyptic number.

1966945380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1966945380 is an abundant number, since it is smaller than the sum of its proper divisors (3544160220).

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

1966945380 is a wasteful number, since it uses less digits than its factorization.

1966945380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21788 (or 21786 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 1966945380 is about 44350.2579473897. The cubic root of 1966945380 is about 1252.9414207394.

The spelling of 1966945380 in words is "one billion, nine hundred sixty-six million, nine hundred forty-five thousand, three hundred eighty".