13233781 has 8 divisors (see below), whose sum is σ = 14552064. Its totient is φ = 11934720.

The previous prime is 13233757. The next prime is 13233793. The reversal of 13233781 is 18733231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13233781 - 2²³ = 4845173 is a prime.

It is a super-2 number, since 2×13233781² = 350265919111922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13233281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3340 + ... + 6133.

It is an arithmetic number, because the mean of its divisors is an integer number (1819008).

Almost surely, 2^13233781 is an apocalyptic number.

13233781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13233781 is the 1945-th centered heptagonal number.

It is an amenable number.

13233781 is a deficient number, since it is larger than the sum of its proper divisors (1318283).

13233781 is a wasteful number, since it uses less digits than its factorization.

13233781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9611.

The product of its digits is 3024, while the sum is 28.

The square root of 13233781 is about 3637.8264114716. The cubic root of 13233781 is about 236.5345836637.

The spelling of 13233781 in words is "thirteen million, two hundred thirty-three thousand, seven hundred eighty-one".