1355521420 has 48 divisors (see below), whose sum is σ = 3119171328. Its totient is φ = 490727360.

The previous prime is 1355521417. The next prime is 1355521471. The reversal of 1355521420 is 241255531.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36369 + ... + 63511.

It is an arithmetic number, because the mean of its divisors is an integer number (64982736).

Almost surely, 2^1355521420 is an apocalyptic number.

1355521420 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 1355521420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1559585664).

1355521420 is an abundant number, since it is smaller than the sum of its proper divisors (1763649908).

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

1355521420 is a wasteful number, since it uses less digits than its factorization.

1355521420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27390 (or 27388 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1355521420 is about 36817.4064811741. The cubic root of 1355521420 is about 1106.7141471298.

Adding to 1355521420 its reverse (241255531), we get a palindrome (1596776951).

The spelling of 1355521420 in words is "one billion, three hundred fifty-five million, five hundred twenty-one thousand, four hundred twenty".