99378739 has 4 divisors (see below), whose sum is σ = 99655920. Its totient is φ = 99101560.

The previous prime is 99378733. The next prime is 99378743. The reversal of 99378739 is 93787399.

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 99378739 - 2¹⁹ = 98854451 is a prime.

It is a super-2 number, since 2×99378739² = 19752267530460242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99378739.

It is not an unprimeable number, because it can be changed into a prime (99378733) 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, 138052 + ... + 138769.

It is an arithmetic number, because the mean of its divisors is an integer number (24913980).

Almost surely, 2^99378739 is an apocalyptic number.

99378739 is a deficient number, since it is larger than the sum of its proper divisors (277181).

99378739 is a wasteful number, since it uses less digits than its factorization.

99378739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277180.

The product of its digits is 2571912, while the sum is 55.

The square root of 99378739 is about 9968.8885538961. Note that the first 3 decimals coincide. The cubic root of 99378739 is about 463.1956732091.

The spelling of 99378739 in words is "ninety-nine million, three hundred seventy-eight thousand, seven hundred thirty-nine".