1240723345 has 16 divisors (see below), whose sum is σ = 1527402240. Its totient is φ = 966960000.

The previous prime is 1240723321. The next prime is 1240723349. The reversal of 1240723345 is 5433270421.

It is a happy number.

It is not a de Polignac number, because 1240723345 - 2¹⁷ = 1240592273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240723349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149926 + ... + 157984.

It is an arithmetic number, because the mean of its divisors is an integer number (95462640).

Almost surely, 2^1240723345 is an apocalyptic number.

It is an amenable number.

1240723345 is a deficient number, since it is larger than the sum of its proper divisors (286678895).

1240723345 is an equidigital number, since it uses as much as digits as its factorization.

1240723345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 1240723345 is about 35223.9030347291. The cubic root of 1240723345 is about 1074.5459326258.

Adding to 1240723345 its reverse (5433270421), we get a palindrome (6673993766).

The spelling of 1240723345 in words is "one billion, two hundred forty million, seven hundred twenty-three thousand, three hundred forty-five".