394961615 has 4 divisors (see below), whose sum is σ = 473953944. Its totient is φ = 315969288.

The previous prime is 394961599. The next prime is 394961617. The reversal of 394961615 is 516169493.

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 394961615 - 2⁴ = 394961599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394961617) 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, 39496157 + ... + 39496166.

It is an arithmetic number, because the mean of its divisors is an integer number (118488486).

Almost surely, 2^394961615 is an apocalyptic number.

394961615 is a deficient number, since it is larger than the sum of its proper divisors (78992329).

394961615 is an equidigital number, since it uses as much as digits as its factorization.

394961615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78992328.

The product of its digits is 174960, while the sum is 44.

The square root of 394961615 is about 19873.6412114137. The cubic root of 394961615 is about 733.6996242890.

The spelling of 394961615 in words is "three hundred ninety-four million, nine hundred sixty-one thousand, six hundred fifteen".