378418021 has 4 divisors (see below), whose sum is σ = 380001600. Its totient is φ = 376834444.

The previous prime is 378417989. The next prime is 378418037. The reversal of 378418021 is 120814873.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120814873 = 1831 ⋅65983.

It is a cyclic number.

It is not a de Polignac number, because 378418021 - 2⁵ = 378417989 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 (378418081) 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, 791431 + ... + 791908.

It is an arithmetic number, because the mean of its divisors is an integer number (95000400).

Almost surely, 2^378418021 is an apocalyptic number.

It is an amenable number.

378418021 is a deficient number, since it is larger than the sum of its proper divisors (1583579).

378418021 is a wasteful number, since it uses less digits than its factorization.

378418021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583578.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 378418021 is about 19452.9694648401. The cubic root of 378418021 is about 723.3091128296.

The spelling of 378418021 in words is "three hundred seventy-eight million, four hundred eighteen thousand, twenty-one".