383957314721 has 6 divisors (see below), whose sum is σ = 385172458230. Its totient is φ = 382745992736.

The previous prime is 383957314717. The next prime is 383957314729. The reversal of 383957314721 is 127413759383.

It can be written as a sum of positive squares in 3 ways, for example, as 523906321 + 383433408400 = 22889^2 + 619220^2 .

It is not a de Polignac number, because 383957314721 - 2² = 383957314717 is a prime.

It is a super-2 number, since 2×383957314721² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (383957314729) 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 5 ways as a sum of consecutive naturals, for example, 1809956 + ... + 2010933.

It is an arithmetic number, because the mean of its divisors is an integer number (64195409705).

Almost surely, 2^383957314721 is an apocalyptic number.

It is an amenable number.

383957314721 is a deficient number, since it is larger than the sum of its proper divisors (1215143509).

383957314721 is an frugal number, since it uses more digits than its factorization.

383957314721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821523 (or 3821206 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 53.

The spelling of 383957314721 in words is "three hundred eighty-three billion, nine hundred fifty-seven million, three hundred fourteen thousand, seven hundred twenty-one".