1331230420 has 24 divisors (see below), whose sum is σ = 3010629384. Its totient is φ = 491531136.

The previous prime is 1331230403. The next prime is 1331230429. The reversal of 1331230420 is 240321331.

It can be written as a sum of positive squares in 4 ways, for example, as 232440516 + 1098789904 = 15246^2 + 33148^2 .

It is a super-2 number, since 2×1331230420² = 3544348862266752800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331230429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2559799 + ... + 2560318.

It is an arithmetic number, because the mean of its divisors is an integer number (125442891).

Almost surely, 2^1331230420 is an apocalyptic number.

1331230420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331230420 is an abundant number, since it is smaller than the sum of its proper divisors (1679398964).

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

1331230420 is a wasteful number, since it uses less digits than its factorization.

1331230420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120139 (or 5120137 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1331230420 is about 36486.0304774307. The cubic root of 1331230420 is about 1100.0634729214.

Adding to 1331230420 its reverse (240321331), we get a palindrome (1571551751).

The spelling of 1331230420 in words is "one billion, three hundred thirty-one million, two hundred thirty thousand, four hundred twenty".