1304021340 has 144 divisors (see below), whose sum is σ = 4239563328. Its totient is φ = 323592192.

The previous prime is 1304021333. The next prime is 1304021351. The reversal of 1304021340 is 431204031.

1304021340 is a `hidden beast` number, since 1 + 304 + 0 + 21 + 340 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 148924 + ... + 157436.

It is an arithmetic number, because the mean of its divisors is an integer number (29441412).

Almost surely, 2^1304021340 is an apocalyptic number.

1304021340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1304021340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119781664).

1304021340 is an abundant number, since it is smaller than the sum of its proper divisors (2935541988).

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

1304021340 is a wasteful number, since it uses less digits than its factorization.

1304021340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588 (or 8583 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1304021340 is about 36111.2356476485. The cubic root of 1304021340 is about 1092.5170738831.

Adding to 1304021340 its reverse (431204031), we get a palindrome (1735225371).

The spelling of 1304021340 in words is "one billion, three hundred four million, twenty-one thousand, three hundred forty".