1391845 has 48 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 798336.

The previous prime is 1391779. The next prime is 1391849. The reversal of 1391845 is 5481931.

It is not a de Polignac number, because 1391845 - 2¹¹ = 1389797 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391849) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60504 + ... + 60526.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2^1391845 is an apocalyptic number.

It is an amenable number.

1391845 is a deficient number, since it is larger than the sum of its proper divisors (906395).

1391845 is a wasteful number, since it uses less digits than its factorization.

1391845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 67 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 1391845 is about 1179.7648070696. The cubic root of 1391845 is about 111.6512589816.

The spelling of 1391845 in words is "one million, three hundred ninety-one thousand, eight hundred forty-five".