109628399 has 4 divisors (see below), whose sum is σ = 109764720. Its totient is φ = 109492080.

The previous prime is 109628377. The next prime is 109628401. The reversal of 109628399 is 993826901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993826901 = 19 ⋅52306679.

It is a cyclic number.

It is not a de Polignac number, because 109628399 - 2¹⁶ = 109562863 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 (109628599) 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, 66947 + ... + 68564.

It is an arithmetic number, because the mean of its divisors is an integer number (27441180).

Almost surely, 2^109628399 is an apocalyptic number.

109628399 is a deficient number, since it is larger than the sum of its proper divisors (136321).

109628399 is an equidigital number, since it uses as much as digits as its factorization.

109628399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136320.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 109628399 is about 10470.3581123092. The cubic root of 109628399 is about 478.6018326354.

The spelling of 109628399 in words is "one hundred nine million, six hundred twenty-eight thousand, three hundred ninety-nine".