3781378247 has 4 divisors (see below), whose sum is σ = 3869317320. Its totient is φ = 3693439176.

The previous prime is 3781378243. The next prime is 3781378253. The reversal of 3781378247 is 7428731873.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7428731873 = 6983 ⋅1063831.

It is a cyclic number.

It is not a de Polignac number, because 3781378247 - 2² = 3781378243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3781378195 and 3781378204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3781378241) 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, 43969472 + ... + 43969557.

It is an arithmetic number, because the mean of its divisors is an integer number (967329330).

Almost surely, 2^3781378247 is an apocalyptic number.

3781378247 is a deficient number, since it is larger than the sum of its proper divisors (87939073).

3781378247 is an equidigital number, since it uses as much as digits as its factorization.

3781378247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87939072.

The product of its digits is 1580544, while the sum is 50.

The square root of 3781378247 is about 61492.9121688020. The cubic root of 3781378247 is about 1557.9375339892.

The spelling of 3781378247 in words is "three billion, seven hundred eighty-one million, three hundred seventy-eight thousand, two hundred forty-seven".