378621 has 16 divisors (see below), whose sum is σ = 577600. Its totient is φ = 244944.

The previous prime is 378619. The next prime is 378629. The reversal of 378621 is 126873.

378621 is a `hidden beast` number, since 37 + 8 + 621 = 666.

It is not a de Polignac number, because 378621 - 2¹ = 378619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (36100).

2³⁷⁸⁶²¹ is an apocalyptic number.

It is an amenable number.

378621 is a deficient number, since it is larger than the sum of its proper divisors (198979).

378621 is a wasteful number, since it uses less digits than its factorization.

378621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 419 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 378621 is about 615.3218669932. The cubic root of 378621 is about 72.3438414563.

It can be divided in two parts, 378 and 621, that added together give a palindrome (999).

The spelling of 378621 in words is "three hundred seventy-eight thousand, six hundred twenty-one".