1393521 has 8 divisors (see below), whose sum is σ = 1889760. Its totient is φ = 913152.

The previous prime is 1393493. The next prime is 1393523. The reversal of 1393521 is 1253931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1393521 - 2⁵ = 1393489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1393491 and 1393500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393523) 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, 3760 + ... + 4113.

It is an arithmetic number, because the mean of its divisors is an integer number (236220).

2^1393521 is an apocalyptic number.

It is an amenable number.

1393521 is a deficient number, since it is larger than the sum of its proper divisors (496239).

1393521 is an equidigital number, since it uses as much as digits as its factorization.

1393521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7935.

The product of its digits is 810, while the sum is 24.

The square root of 1393521 is about 1180.4749044347. The cubic root of 1393521 is about 111.6960562231.

The spelling of 1393521 in words is "one million, three hundred ninety-three thousand, five hundred twenty-one".