1320440231 has 8 divisors (see below), whose sum is σ = 1471129344. Its totient is φ = 1174859320.

The previous prime is 1320440203. The next prime is 1320440239.

1320440231 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320440231 is a prime.

It is a super-2 number, since 2×1320440231² = 3487124807286666722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320440239) 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, 1276505 + ... + 1277538.

It is an arithmetic number, because the mean of its divisors is an integer number (183891168).

Almost surely, 2^1320440231 is an apocalyptic number.

1320440231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320440231 is a deficient number, since it is larger than the sum of its proper divisors (150689113).

1320440231 is a wasteful number, since it uses less digits than its factorization.

1320440231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2554101.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1320440231 is about 36337.8622238568. The cubic root of 1320440231 is about 1097.0832455115.

It can be divided in two parts, 13204 and 40231, that added together give a palindrome (53435).

The spelling of 1320440231 in words is "one billion, three hundred twenty million, four hundred forty thousand, two hundred thirty-one".