15557423 has 8 divisors (see below), whose sum is σ = 18158592. Its totient is φ = 13050936.

The previous prime is 15557419. The next prime is 15557459. The reversal of 15557423 is 32475551.

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 15557423 - 2² = 15557419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15557423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15557473) 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, 23315 + ... + 23972.

It is an arithmetic number, because the mean of its divisors is an integer number (2269824).

Almost surely, 2^15557423 is an apocalyptic number.

15557423 is a deficient number, since it is larger than the sum of its proper divisors (2601169).

15557423 is an equidigital number, since it uses as much as digits as its factorization.

15557423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47341.

The product of its digits is 21000, while the sum is 32.

The square root of 15557423 is about 3944.2899234209. The cubic root of 15557423 is about 249.6390684979.

The spelling of 15557423 in words is "fifteen million, five hundred fifty-seven thousand, four hundred twenty-three".