378931421 has 16 divisors (see below), whose sum is σ = 435863040. Its totient is φ = 325807920.

The previous prime is 378931387. The next prime is 378931433. The reversal of 378931421 is 124139873.

It is a cyclic number.

It is not a de Polignac number, because 378931421 - 2¹⁰ = 378930397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378931481) 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, 170906 + ... + 173108.

It is an arithmetic number, because the mean of its divisors is an integer number (27241440).

Almost surely, 2^378931421 is an apocalyptic number.

It is an amenable number.

378931421 is a deficient number, since it is larger than the sum of its proper divisors (56931619).

378931421 is a wasteful number, since it uses less digits than its factorization.

378931421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056.

The product of its digits is 36288, while the sum is 38.

The square root of 378931421 is about 19466.1609209418. The cubic root of 378931421 is about 723.6360696770.

The spelling of 378931421 in words is "three hundred seventy-eight million, nine hundred thirty-one thousand, four hundred twenty-one".