378665715 has 16 divisors (see below), whose sum is σ = 606199968. Its totient is φ = 201843456.

The previous prime is 378665711. The next prime is 378665741. The reversal of 378665715 is 517566873.

It is not a de Polignac number, because 378665715 - 2² = 378665711 is a prime.

It is a super-2 number, since 2×378665715² = 286775447432922450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (378665711) 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, 26149 + ... + 37961.

It is an arithmetic number, because the mean of its divisors is an integer number (37887498).

Almost surely, 2^378665715 is an apocalyptic number.

378665715 is a deficient number, since it is larger than the sum of its proper divisors (227534253).

378665715 is a wasteful number, since it uses less digits than its factorization.

378665715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13958.

The product of its digits is 1058400, while the sum is 48.

The square root of 378665715 is about 19459.3349064145. The cubic root of 378665715 is about 723.4668927115.

The spelling of 378665715 in words is "three hundred seventy-eight million, six hundred sixty-five thousand, seven hundred fifteen".