23489781 has 16 divisors (see below), whose sum is σ = 36249600. Its totient is φ = 13251888.

The previous prime is 23489779. The next prime is 23489789. The reversal of 23489781 is 18798432.

It is not a de Polignac number, because 23489781 - 2¹ = 23489779 is a prime.

It is a super-2 number, since 2×23489781² = 1103539622855922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23489789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5421 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (2265600).

Almost surely, 2^23489781 is an apocalyptic number.

23489781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

23489781 is a deficient number, since it is larger than the sum of its proper divisors (12759819).

23489781 is a wasteful number, since it uses less digits than its factorization.

23489781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14248.

The product of its digits is 96768, while the sum is 42.

The square root of 23489781 is about 4846.6257334356. The cubic root of 23489781 is about 286.3911912558.

The spelling of 23489781 in words is "twenty-three million, four hundred eighty-nine thousand, seven hundred eighty-one".