378427815 has 32 divisors (see below), whose sum is σ = 695966400. Its totient is φ = 194866560.

The previous prime is 378427813. The next prime is 378427817. The reversal of 378427815 is 518724873.

378427815 is a `hidden beast` number, since 378 + 4 + 278 + 1 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (378427813) and next prime (378427817).

It is not a de Polignac number, because 378427815 - 2¹ = 378427813 is a prime.

It is a super-2 number, since 2×378427815² = 286415222331348450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378427813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44416 + ... + 52245.

It is an arithmetic number, because the mean of its divisors is an integer number (21748950).

Almost surely, 2^378427815 is an apocalyptic number.

378427815 is a deficient number, since it is larger than the sum of its proper divisors (317538585).

378427815 is a wasteful number, since it uses less digits than its factorization.

378427815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96704 (or 96698 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 378427815 is about 19453.2211985573. The cubic root of 378427815 is about 723.3153528675.

The spelling of 378427815 in words is "three hundred seventy-eight million, four hundred twenty-seven thousand, eight hundred fifteen".