393999353949894 has 64 divisors (see below), whose sum is σ = 1034147313192960. Its totient is φ = 96951310607520.

The previous prime is 393999353949871. The next prime is 393999353949917. The reversal of 393999353949894 is 498949353999393.

It is an interprime number because it is at equal distance from previous prime (393999353949871) and next prime (393999353949917).

It is a super-2 number, since 2×393999353949894² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22442424234 + ... + 22442441789.

It is an arithmetic number, because the mean of its divisors is an integer number (16158551768640).

Almost surely, 2^{393999353949894} is an apocalyptic number.

393999353949894 is an abundant number, since it is smaller than the sum of its proper divisors (640147959243066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

393999353949894 is a wasteful number, since it uses less digits than its factorization.

393999353949894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44884866065.

The product of its digits is 247949112960, while the sum is 96.

The spelling of 393999353949894 in words is "three hundred ninety-three trillion, nine hundred ninety-nine billion, three hundred fifty-three million, nine hundred forty-nine thousand, eight hundred ninety-four".