915421 has 8 divisors (see below), whose sum is σ = 1001504. Its totient is φ = 831600.

The previous prime is 915391. The next prime is 915437. The reversal of 915421 is 124519.

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 915421 - 2¹¹ = 913373 is a prime.

It is a Duffinian number.

915421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 915392 and 915401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915451) 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, 346 + ... + 1396.

It is an arithmetic number, because the mean of its divisors is an integer number (125188).

2⁹¹⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

915421 is a deficient number, since it is larger than the sum of its proper divisors (86083).

915421 is a wasteful number, since it uses less digits than its factorization.

915421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its digits is 360, while the sum is 22.

The square root of 915421 is about 956.7763584036. The cubic root of 915421 is about 97.0972560522.

The spelling of 915421 in words is "nine hundred fifteen thousand, four hundred twenty-one".