1205420157829 has 4 divisors (see below), whose sum is σ = 1205660142976. Its totient is φ = 1205180172684.

The previous prime is 1205420157793. The next prime is 1205420157871. The reversal of 1205420157829 is 9287510245021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1205420157829 - 2⁷ = 1205420157701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205420137829) 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 3 ways as a sum of consecutive naturals, for example, 119985039 + ... + 119995084.

It is an arithmetic number, because the mean of its divisors is an integer number (301415035744).

Almost surely, 2^{1205420157829} is an apocalyptic number.

It is an amenable number.

1205420157829 is a deficient number, since it is larger than the sum of its proper divisors (239985147).

1205420157829 is an equidigital number, since it uses as much as digits as its factorization.

1205420157829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239985146.

The product of its (nonzero) digits is 403200, while the sum is 46.

The spelling of 1205420157829 in words is "one trillion, two hundred five billion, four hundred twenty million, one hundred fifty-seven thousand, eight hundred twenty-nine".