394955561 has 32 divisors (see below), whose sum is σ = 531987456. Its totient is φ = 283176000.

The previous prime is 394955549. The next prime is 394955581. The reversal of 394955561 is 165559493.

It is a cyclic number.

It is not a de Polignac number, because 394955561 - 2¹⁸ = 394693417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (394955581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 571226 + ... + 571916.

It is an arithmetic number, because the mean of its divisors is an integer number (16624608).

Almost surely, 2^394955561 is an apocalyptic number.

It is an amenable number.

394955561 is a deficient number, since it is larger than the sum of its proper divisors (137031895).

394955561 is a wasteful number, since it uses less digits than its factorization.

394955561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its digits is 729000, while the sum is 47.

The square root of 394955561 is about 19873.4888985301. The cubic root of 394955561 is about 733.6958755364.

The spelling of 394955561 in words is "three hundred ninety-four million, nine hundred fifty-five thousand, five hundred sixty-one".