398447705993 has 4 divisors (see below), whose sum is σ = 403248280848. Its totient is φ = 393647131140.

The previous prime is 398447705989. The next prime is 398447706023. The reversal of 398447705993 is 399507744893.

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 398447705993 - 2² = 398447705989 is a prime.

It is a super-2 number, since 2×398447705993² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398447705963) 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, 2400287303 + ... + 2400287468.

It is an arithmetic number, because the mean of its divisors is an integer number (100812070212).

Almost surely, 2^398447705993 is an apocalyptic number.

It is an amenable number.

398447705993 is a deficient number, since it is larger than the sum of its proper divisors (4800574855).

398447705993 is an equidigital number, since it uses as much as digits as its factorization.

398447705993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4800574854.

The product of its (nonzero) digits is 205752960, while the sum is 68.

The spelling of 398447705993 in words is "three hundred ninety-eight billion, four hundred forty-seven million, seven hundred five thousand, nine hundred ninety-three".