15421489 has 4 divisors (see below), whose sum is σ = 15838324. Its totient is φ = 15004656.

The previous prime is 15421487. The next prime is 15421493. The reversal of 15421489 is 98412451.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98412451 = 3089 ⋅31859.

It can be written as a sum of positive squares in 2 ways, for example, as 5290000 + 10131489 = 2300^2 + 3183^2 .

It is a cyclic number.

It is not a de Polignac number, because 15421489 - 2¹ = 15421487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15421487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208362 + ... + 208435.

It is an arithmetic number, because the mean of its divisors is an integer number (3959581).

Almost surely, 2^15421489 is an apocalyptic number.

It is an amenable number.

15421489 is a deficient number, since it is larger than the sum of its proper divisors (416835).

15421489 is an equidigital number, since it uses as much as digits as its factorization.

15421489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416834.

The product of its digits is 11520, while the sum is 34.

The square root of 15421489 is about 3927.0203717322. The cubic root of 15421489 is about 248.9098612999.

The spelling of 15421489 in words is "fifteen million, four hundred twenty-one thousand, four hundred eighty-nine".