1213620320 has 72 divisors (see below), whose sum is σ = 3151576512. Its totient is φ = 441309440.

The previous prime is 1213620311. The next prime is 1213620337. The reversal of 1213620320 is 230263121.

It is a happy number.

It is a super-2 number, since 2×1213620320² = 2945748562233804800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1213620292 and 1213620301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11984 + ... + 50703.

It is an arithmetic number, because the mean of its divisors is an integer number (43771896).

Almost surely, 2^1213620320 is an apocalyptic number.

1213620320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213620320 is an abundant number, since it is smaller than the sum of its proper divisors (1937956192).

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

1213620320 is a wasteful number, since it uses less digits than its factorization.

1213620320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62724 (or 62705 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213620320 is about 34837.0538363967. The cubic root of 1213620320 is about 1066.6639392291.

Adding to 1213620320 its reverse (230263121), we get a palindrome (1443883441).

The spelling of 1213620320 in words is "one billion, two hundred thirteen million, six hundred twenty thousand, three hundred twenty".