23898109 has 4 divisors (see below), whose sum is σ = 24018400. Its totient is φ = 23777820.

The previous prime is 23898089. The next prime is 23898113. The reversal of 23898109 is 90189832.

23898109 = T₃₉₉₀ + T₃₉₉₁ + T₃₉₉₂.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23898109 - 2¹⁵ = 23865341 is a prime.

It is a super-2 number, since 2×23898109² = 1142239227551762, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23898139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59847 + ... + 60244.

It is an arithmetic number, because the mean of its divisors is an integer number (6004600).

Almost surely, 2^23898109 is an apocalyptic number.

23898109 is the 3992-nd centered triangular number.

It is an amenable number.

23898109 is a deficient number, since it is larger than the sum of its proper divisors (120291).

23898109 is a wasteful number, since it uses less digits than its factorization.

23898109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120290.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 23898109 is about 4888.5692180842. The cubic root of 23898109 is about 288.0411343317.

The spelling of 23898109 in words is "twenty-three million, eight hundred ninety-eight thousand, one hundred nine".