394836826961951 has 4 divisors (see below), whose sum is σ = 430731083958504. Its totient is φ = 358942569965400.

The previous prime is 394836826961891. The next prime is 394836826961971. The reversal of 394836826961951 is 159169628638493.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 394836826961951 - 2³⁰ = 394835753220127 is a prime.

It is a super-2 number, since 2×394836826961951² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394836826961971) 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, 17947128498260 + ... + 17947128498281.

It is an arithmetic number, because the mean of its divisors is an integer number (107682770989626).

Almost surely, 2^{394836826961951} is an apocalyptic number.

394836826961951 is a deficient number, since it is larger than the sum of its proper divisors (35894256996553).

394836826961951 is a wasteful number, since it uses less digits than its factorization.

394836826961951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35894256996552.

The product of its digits is 3627970560, while the sum is 80.

The spelling of 394836826961951 in words is "three hundred ninety-four trillion, eight hundred thirty-six billion, eight hundred twenty-six million, nine hundred sixty-one thousand, nine hundred fifty-one".