194640434 has 4 divisors (see below), whose sum is σ = 291960654. Its totient is φ = 97320216.

The previous prime is 194640409. The next prime is 194640443. The reversal of 194640434 is 434046491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434046491 = 853 ⋅508847.

It can be written as a sum of positive squares in only one way, i.e., 127351225 + 67289209 = 11285^2 + 8203^2 .

It is a junction number, because it is equal to n+sod(n) for n = 194640394 and 194640403.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48660107 + ... + 48660110.

Almost surely, 2^194640434 is an apocalyptic number.

194640434 is a deficient number, since it is larger than the sum of its proper divisors (97320220).

194640434 is an equidigital number, since it uses as much as digits as its factorization.

194640434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97320219.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 194640434 is about 13951.3595753245. The cubic root of 194640434 is about 579.5323559056.

The spelling of 194640434 in words is "one hundred ninety-four million, six hundred forty thousand, four hundred thirty-four".