394419631 has 4 divisors (see below), whose sum is σ = 404039664. Its totient is φ = 384799600.

The previous prime is 394419583. The next prime is 394419653. The reversal of 394419631 is 136914493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136914493 = 73 ⋅1875541.

It is a cyclic number.

It is not a de Polignac number, because 394419631 - 2⁷ = 394419503 is a prime.

It is a super-2 number, since 2×394419631² = 311133690636352322, which 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 (394419131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4809955 + ... + 4810036.

It is an arithmetic number, because the mean of its divisors is an integer number (101009916).

Almost surely, 2^394419631 is an apocalyptic number.

394419631 is a deficient number, since it is larger than the sum of its proper divisors (9620033).

394419631 is an equidigital number, since it uses as much as digits as its factorization.

394419631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9620032.

The product of its digits is 69984, while the sum is 40.

The square root of 394419631 is about 19860.0007804632. Note that the first 3 decimals coincide. The cubic root of 394419631 is about 733.3638655102.

The spelling of 394419631 in words is "three hundred ninety-four million, four hundred nineteen thousand, six hundred thirty-one".