1378647 has 8 divisors (see below), whose sum is σ = 2042480. Its totient is φ = 919080.

The previous prime is 1378639. The next prime is 1378669. The reversal of 1378647 is 7468731.

1378647 is a `hidden beast` number, since 1 + 3 + 7 + 8 + 647 = 666.

It is not a de Polignac number, because 1378647 - 2³ = 1378639 is a prime.

It is a super-3 number, since 3×1378647³ = 7861048849933338069, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25504 + ... + 25557.

It is an arithmetic number, because the mean of its divisors is an integer number (255310).

2^1378647 is an apocalyptic number.

1378647 is a deficient number, since it is larger than the sum of its proper divisors (663833).

1378647 is an equidigital number, since it uses as much as digits as its factorization.

1378647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51070 (or 51064 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1378647 is about 1174.1579961828. The cubic root of 1378647 is about 111.2972311340.

It can be divided in two parts, 1378 and 647, that added together give a square (2025 = 45²).

The spelling of 1378647 in words is "one million, three hundred seventy-eight thousand, six hundred forty-seven".