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12440431211 = 13371173461
BaseRepresentation
bin10111001011000000…
…11110101001101011
31012002222212101101112
423211200132221223
5200434222244321
65414241340535
7620166630515
oct134540365153
935088771345
1012440431211
11530433210a
1224b233774b
131233491000
14860308bb5
154cc26da5b
hex2e581ea6b

12440431211 has 32 divisors (see below), whose sum is σ = 13775287680. Its totient is φ = 11231875200.

The previous prime is 12440431189. The next prime is 12440431219. The reversal of 12440431211 is 11213404421.

It is a de Polignac number, because none of the positive numbers 2k-12440431211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440431219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26985521 + ... + 26985981.

It is an arithmetic number, because the mean of its divisors is an integer number (430477740).

Almost surely, 212440431211 is an apocalyptic number.

12440431211 is a deficient number, since it is larger than the sum of its proper divisors (1334856469).

12440431211 is an equidigital number, since it uses as much as digits as its factorization.

12440431211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12440431211 its reverse (11213404421), we get a palindrome (23653835632).

The spelling of 12440431211 in words is "twelve billion, four hundred forty million, four hundred thirty-one thousand, two hundred eleven".

Divisors: 1 13 71 169 173 461 923 2197 2249 5993 11999 12283 29237 32731 77909 79753 155987 159679 380081 425503 1012817 1036789 2075827 5531539 5662463 13478257 26985751 71910007 73612019 175217341 956956247 12440431211