1205421364 has 48 divisors (see below), whose sum is σ = 2475244800. Its totient is φ = 513418080.

The previous prime is 1205421359. The next prime is 1205421403. The reversal of 1205421364 is 4631245021.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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, 226494 + ... + 231754.

It is an arithmetic number, because the mean of its divisors is an integer number (51567600).

Almost surely, 2^1205421364 is an apocalyptic number.

1205421364 is a gapful number since it is divisible by the number (14) 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 1205421364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237622400).

1205421364 is an abundant number, since it is smaller than the sum of its proper divisors (1269823436).

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

1205421364 is a wasteful number, since it uses less digits than its factorization.

1205421364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5453 (or 5437 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1205421364 is about 34719.1786193164. The cubic root of 1205421364 is about 1064.2564594171.

Adding to 1205421364 its reverse (4631245021), we get a palindrome (5836666385).

The spelling of 1205421364 in words is "one billion, two hundred five million, four hundred twenty-one thousand, three hundred sixty-four".