1779881940 has 72 divisors (see below), whose sum is σ = 5402412288. Its totient is φ = 474333120.

The previous prime is 1779881903. The next prime is 1779881941. The reversal of 1779881940 is 491889771.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1779881941) 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 23 ways as a sum of consecutive naturals, for example, 542505 + ... + 545775.

It is an arithmetic number, because the mean of its divisors is an integer number (75033504).

Almost surely, 2^1779881940 is an apocalyptic number.

1779881940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1779881940 is an abundant number, since it is smaller than the sum of its proper divisors (3622530348).

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

1779881940 is a wasteful number, since it uses less digits than its factorization.

1779881940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309 (or 6304 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The square root of 1779881940 is about 42188.6470510729. The cubic root of 1779881940 is about 1211.8914796800.

The spelling of 1779881940 in words is "one billion, seven hundred seventy-nine million, eight hundred eighty-one thousand, nine hundred forty".