15720423 has 4 divisors (see below), whose sum is σ = 20960568. Its totient is φ = 10480280.

The previous prime is 15720421. The next prime is 15720437. The reversal of 15720423 is 32402751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15720423 - 2¹ = 15720421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15720393 and 15720402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15720421) 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, 2620068 + ... + 2620073.

It is an arithmetic number, because the mean of its divisors is an integer number (5240142).

Almost surely, 2^15720423 is an apocalyptic number.

15720423 is a deficient number, since it is larger than the sum of its proper divisors (5240145).

15720423 is an equidigital number, since it uses as much as digits as its factorization.

15720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240144.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 15720423 is about 3964.8988637795. The cubic root of 15720423 is about 250.5078901583.

The spelling of 15720423 in words is "fifteen million, seven hundred twenty thousand, four hundred twenty-three".