1259920243 has 8 divisors (see below), whose sum is σ = 1315065600. Its totient is φ = 1204805448.

The previous prime is 1259920219. The next prime is 1259920261. The reversal of 1259920243 is 3420299521.

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

It is a cyclic number.

It is not a de Polignac number, because 1259920243 - 2¹³ = 1259912051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1259920273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128178 + ... + 137656.

It is an arithmetic number, because the mean of its divisors is an integer number (164383200).

Almost surely, 2^1259920243 is an apocalyptic number.

1259920243 is a deficient number, since it is larger than the sum of its proper divisors (55145357).

1259920243 is an equidigital number, since it uses as much as digits as its factorization.

1259920243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15281.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1259920243 is about 35495.3552313539. The cubic root of 1259920243 is about 1080.0595083237.

The spelling of 1259920243 in words is "one billion, two hundred fifty-nine million, nine hundred twenty thousand, two hundred forty-three".