393721368109 has 8 divisors (see below), whose sum is σ = 428148515448. Its totient is φ = 360546117120.

The previous prime is 393721368097. The next prime is 393721368121. The reversal of 393721368109 is 901863127393.

It is an interprime number because it is at equal distance from previous prime (393721368097) and next prime (393721368121).

It can be written as a sum of positive squares in 4 ways, for example, as 251933724900 + 141787643209 = 501930^2 + 376547^2 .

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 393721368109 - 2¹⁷ = 393721237037 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 (393721363109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312973432 + ... + 312974689.

It is an arithmetic number, because the mean of its divisors is an integer number (53518564431).

Almost surely, 2^393721368109 is an apocalyptic number.

It is an amenable number.

393721368109 is a deficient number, since it is larger than the sum of its proper divisors (34427147339).

393721368109 is a wasteful number, since it uses less digits than its factorization.

393721368109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625948175.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 393721368109 in words is "three hundred ninety-three billion, seven hundred twenty-one million, three hundred sixty-eight thousand, one hundred nine".