381720085837 has 4 divisors (see below), whose sum is σ = 381721325596. Its totient is φ = 381718846080.

The previous prime is 381720085829. The next prime is 381720085897. The reversal of 381720085837 is 738580027183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 96429501961 + 285290583876 = 310531^2 + 534126^2 .

It is a cyclic number.

It is not a de Polignac number, because 381720085837 - 2³ = 381720085829 is a prime.

It is a super-3 number, since 3×381720085837³ (a number of 36 digits) contains 333 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 (381720085807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234493 + ... + 904669.

It is an arithmetic number, because the mean of its divisors is an integer number (95430331399).

Almost surely, 2^381720085837 is an apocalyptic number.

It is an amenable number.

381720085837 is a deficient number, since it is larger than the sum of its proper divisors (1239759).

381720085837 is an equidigital number, since it uses as much as digits as its factorization.

381720085837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239758.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 381720085837 in words is "three hundred eighty-one billion, seven hundred twenty million, eighty-five thousand, eight hundred thirty-seven".