99404642 has 4 divisors (see below), whose sum is σ = 149106966. Its totient is φ = 49702320.

The previous prime is 99404639. The next prime is 99404647. The reversal of 99404642 is 24640499.

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., 98386561 + 1018081 = 9919^2 + 1009^2 .

It is a super-2 number, since 2×99404642² = 19762565702296328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99404596 and 99404605.

It is not an unprimeable number, because it can be changed into a prime (99404647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24851159 + ... + 24851162.

Almost surely, 2^99404642 is an apocalyptic number.

99404642 is a deficient number, since it is larger than the sum of its proper divisors (49702324).

99404642 is a wasteful number, since it uses less digits than its factorization.

99404642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49702323.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 99404642 is about 9970.1876612228. The cubic root of 99404642 is about 463.2359135910.

The spelling of 99404642 in words is "ninety-nine million, four hundred four thousand, six hundred forty-two".