394448243981 has 4 divisors (see below), whose sum is σ = 430307175264. Its totient is φ = 358589312700.

The previous prime is 394448243921. The next prime is 394448243983. The reversal of 394448243981 is 189342844493.

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 394448243981 - 2²² = 394444049677 is a prime.

It is a super-2 number, since 2×394448243981² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394448243981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394448243983) 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, 17929465625 + ... + 17929465646.

It is an arithmetic number, because the mean of its divisors is an integer number (107576793816).

Almost surely, 2^394448243981 is an apocalyptic number.

It is an amenable number.

394448243981 is a deficient number, since it is larger than the sum of its proper divisors (35858931283).

394448243981 is a wasteful number, since it uses less digits than its factorization.

394448243981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35858931282.

The product of its digits is 23887872, while the sum is 59.

The spelling of 394448243981 in words is "three hundred ninety-four billion, four hundred forty-eight million, two hundred forty-three thousand, nine hundred eighty-one".