1684779380 has 24 divisors (see below), whose sum is σ = 3624332040. Its totient is φ = 657474560.

The previous prime is 1684779379. The next prime is 1684779391. The reversal of 1684779380 is 839774861.

It can be written as a sum of positive squares in 4 ways, for example, as 32194276 + 1652585104 = 5674^2 + 40652^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1026485 + ... + 1028124.

It is an arithmetic number, because the mean of its divisors is an integer number (151013835).

Almost surely, 2^1684779380 is an apocalyptic number.

1684779380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684779380 is an abundant number, since it is smaller than the sum of its proper divisors (1939552660).

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

1684779380 is a wasteful number, since it uses less digits than its factorization.

1684779380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054659 (or 2054657 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The square root of 1684779380 is about 41046.0641231288. The cubic root of 1684779380 is about 1189.9106351930.

It can be divided in two parts, 1684779 and 380, that added together give a cube (1685159 = 119³).

The spelling of 1684779380 in words is "one billion, six hundred eighty-four million, seven hundred seventy-nine thousand, three hundred eighty".