1321906384 has 10 divisors (see below), whose sum is σ = 2561193650. Its totient is φ = 660953184.

The previous prime is 1321906381. The next prime is 1321906403. The reversal of 1321906384 is 4836091231.

It can be written as a sum of positive squares in only one way, i.e., 1244113984 + 77792400 = 35272^2 + 8820^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321906381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41309559 + ... + 41309590.

It is an arithmetic number, because the mean of its divisors is an integer number (256119365).

Almost surely, 2^1321906384 is an apocalyptic number.

It is an amenable number.

1321906384 is a deficient number, since it is larger than the sum of its proper divisors (1239287266).

1321906384 is an equidigital number, since it uses as much as digits as its factorization.

1321906384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82619157 (or 82619151 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1321906384 is about 36358.0305297193. The cubic root of 1321906384 is about 1097.4891447186.

The spelling of 1321906384 in words is "one billion, three hundred twenty-one million, nine hundred six thousand, three hundred eighty-four".