378705109 has 4 divisors (see below), whose sum is σ = 380820960. Its totient is φ = 376589260.

The previous prime is 378705091. The next prime is 378705161. The reversal of 378705109 is 901507873.

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: 901507873 = 7 ⋅128786839.

It is a cyclic number.

It is not a de Polignac number, because 378705109 - 2¹⁵ = 378672341 is a prime.

It is a super-3 number, since 3×378705109³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378705199) 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, 1057657 + ... + 1058014.

It is an arithmetic number, because the mean of its divisors is an integer number (95205240).

Almost surely, 2^378705109 is an apocalyptic number.

It is an amenable number.

378705109 is a deficient number, since it is larger than the sum of its proper divisors (2115851).

378705109 is a wasteful number, since it uses less digits than its factorization.

378705109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115850.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 378705109 is about 19460.3470935130. The cubic root of 378705109 is about 723.4919801570.

The spelling of 378705109 in words is "three hundred seventy-eight million, seven hundred five thousand, one hundred nine".