616992394 has 4 divisors (see below), whose sum is σ = 925488594. Its totient is φ = 308496196.

The previous prime is 616992391. The next prime is 616992413. The reversal of 616992394 is 493299616.

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

It can be written as a sum of positive squares in only one way, i.e., 562306369 + 54686025 = 23713^2 + 7395^2 .

It is a super-2 number, since 2×616992394² = 761359228507702472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (616992391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154248097 + ... + 154248100.

Almost surely, 2^616992394 is an apocalyptic number.

616992394 is a deficient number, since it is larger than the sum of its proper divisors (308496200).

616992394 is a wasteful number, since it uses less digits than its factorization.

616992394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308496199.

The product of its digits is 629856, while the sum is 49.

The square root of 616992394 is about 24839.3315932615. The cubic root of 616992394 is about 851.3208502192.

The spelling of 616992394 in words is "six hundred sixteen million, nine hundred ninety-two thousand, three hundred ninety-four".