1383449780 has 18 divisors (see below), whose sum is σ = 2905593894. Its totient is φ = 553313376.

The previous prime is 1383449779. The next prime is 1383449833. The reversal of 1383449780 is 879443831.

It can be written as a sum of positive squares in 3 ways, for example, as 948393616 + 435056164 = 30796^2 + 20858^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162182 + ... + 170498.

It is an arithmetic number, because the mean of its divisors is an integer number (161421883).

Almost surely, 2^1383449780 is an apocalyptic number.

1383449780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1383449780 is an abundant number, since it is smaller than the sum of its proper divisors (1522144114).

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

1383449780 is an frugal number, since it uses more digits than its factorization.

1383449780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16643 (or 8324 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 1383449780 is about 37194.7547377315. The cubic root of 1383449780 is about 1114.2632306130.

The spelling of 1383449780 in words is "one billion, three hundred eighty-three million, four hundred forty-nine thousand, seven hundred eighty".