378121453 has 4 divisors (see below), whose sum is σ = 378611388. Its totient is φ = 377631520.

The previous prime is 378121441. The next prime is 378121511. The reversal of 378121453 is 354121873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27008809 + 351112644 = 5197^2 + 18738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378121453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378121153) 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, 243808 + ... + 245353.

It is an arithmetic number, because the mean of its divisors is an integer number (94652847).

Almost surely, 2^378121453 is an apocalyptic number.

It is an amenable number.

378121453 is a deficient number, since it is larger than the sum of its proper divisors (489935).

378121453 is an equidigital number, since it uses as much as digits as its factorization.

378121453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489934.

The product of its digits is 20160, while the sum is 34.

The square root of 378121453 is about 19445.3452784979. The cubic root of 378121453 is about 723.1201098513.

The spelling of 378121453 in words is "three hundred seventy-eight million, one hundred twenty-one thousand, four hundred fifty-three".