378758021 has 4 divisors (see below), whose sum is σ = 378895200. Its totient is φ = 378620844.

The previous prime is 378757987. The next prime is 378758063. The reversal of 378758021 is 120857873.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 378758021 - 2⁶ = 378757957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 378758021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378758221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64361 + ... + 69998.

It is an arithmetic number, because the mean of its divisors is an integer number (94723800).

Almost surely, 2^378758021 is an apocalyptic number.

It is an amenable number.

378758021 is a deficient number, since it is larger than the sum of its proper divisors (137179).

378758021 is a wasteful number, since it uses less digits than its factorization.

378758021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137178.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 378758021 is about 19461.7065284625. The cubic root of 378758021 is about 723.5256735894.

The spelling of 378758021 in words is "three hundred seventy-eight million, seven hundred fifty-eight thousand, twenty-one".