378811787 has 4 divisors (see below), whose sum is σ = 380252400. Its totient is φ = 377371176.

The previous prime is 378811781. The next prime is 378811831. The reversal of 378811787 is 787118873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787118873 = 149 ⋅5282677.

It is a cyclic number.

It is not a de Polignac number, because 378811787 - 2¹⁰ = 378810763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378811781) 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, 719912 + ... + 720437.

It is an arithmetic number, because the mean of its divisors is an integer number (95063100).

Almost surely, 2^378811787 is an apocalyptic number.

378811787 is a deficient number, since it is larger than the sum of its proper divisors (1440613).

378811787 is a wasteful number, since it uses less digits than its factorization.

378811787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440612.

The product of its digits is 526848, while the sum is 50.

The square root of 378811787 is about 19463.0878074369. The cubic root of 378811787 is about 723.5599076197.

The spelling of 378811787 in words is "three hundred seventy-eight million, eight hundred eleven thousand, seven hundred eighty-seven".