15780023 has 8 divisors (see below), whose sum is σ = 18616320. Its totient is φ = 13089240.

The previous prime is 15780007. The next prime is 15780049. The reversal of 15780023 is 32008751.

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 15780023 - 2⁴ = 15780007 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 15779974 and 15780001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15780073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36143 + ... + 36576.

It is an arithmetic number, because the mean of its divisors is an integer number (2327040).

Almost surely, 2^15780023 is an apocalyptic number.

15780023 is a deficient number, since it is larger than the sum of its proper divisors (2836297).

15780023 is an equidigital number, since it uses as much as digits as its factorization.

15780023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72757.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 15780023 is about 3972.4077081790. The cubic root of 15780023 is about 250.8240699833.

Adding to 15780023 its reverse (32008751), we get a palindrome (47788774).

The spelling of 15780023 in words is "fifteen million, seven hundred eighty thousand, twenty-three".