99989378 has 4 divisors (see below), whose sum is σ = 149984070. Its totient is φ = 49994688.

The previous prime is 99989369. The next prime is 99989389. The reversal of 99989378 is 87398999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87398999 = 233 ⋅375103.

It can be written as a sum of positive squares in only one way, i.e., 96687889 + 3301489 = 9833^2 + 1817^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99989378.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24997343 + ... + 24997346.

Almost surely, 2^99989378 is an apocalyptic number.

99989378 is a deficient number, since it is larger than the sum of its proper divisors (49994692).

99989378 is a wasteful number, since it uses less digits than its factorization.

99989378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49994691.

The product of its digits is 8817984, while the sum is 62.

The square root of 99989378 is about 9999.4688858959. The cubic root of 99989378 is about 464.1424484605.

The spelling of 99989378 in words is "ninety-nine million, nine hundred eighty-nine thousand, three hundred seventy-eight".