378045021 has 16 divisors (see below), whose sum is σ = 525420224. Its totient is φ = 241553664.

The previous prime is 378045011. The next prime is 378045047. The reversal of 378045021 is 120540873.

It is not a de Polignac number, because 378045021 - 2⁷ = 378044893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 378045021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378045011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17980 + ... + 32853.

It is an arithmetic number, because the mean of its divisors is an integer number (32838764).

Almost surely, 2^378045021 is an apocalyptic number.

It is an amenable number.

378045021 is a deficient number, since it is larger than the sum of its proper divisors (147375203).

378045021 is a wasteful number, since it uses less digits than its factorization.

378045021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50940.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 378045021 is about 19443.3798759372. The cubic root of 378045021 is about 723.0713836725.

Adding to 378045021 its reverse (120540873), we get a palindrome (498585894).

The spelling of 378045021 in words is "three hundred seventy-eight million, forty-five thousand, twenty-one".