378521 has 8 divisors (see below), whose sum is σ = 444864. Its totient is φ = 317520.

The previous prime is 378509. The next prime is 378523. The reversal of 378521 is 125873.

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 378521 - 2¹⁴ = 362137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378523) 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, 1181 + ... + 1466.

It is an arithmetic number, because the mean of its divisors is an integer number (55608).

2³⁷⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

378521 is a deficient number, since it is larger than the sum of its proper divisors (66343).

378521 is a wasteful number, since it uses less digits than its factorization.

378521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671.

The product of its digits is 1680, while the sum is 26.

The square root of 378521 is about 615.2406033415. The cubic root of 378521 is about 72.3374718315.

It can be divided in two parts, 37 and 8521, that added together give a palindrome (8558).

The spelling of 378521 in words is "three hundred seventy-eight thousand, five hundred twenty-one".