1391855 has 12 divisors (see below), whose sum is σ = 1735032. Its totient is φ = 1071840.

The previous prime is 1391849. The next prime is 1391861. The reversal of 1391855 is 5581931.

It is an interprime number because it is at equal distance from previous prime (1391849) and next prime (1391861).

It is not a de Polignac number, because 1391855 - 2¹⁶ = 1326319 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4040 + ... + 4370.

It is an arithmetic number, because the mean of its divisors is an integer number (144586).

2^1391855 is an apocalyptic number.

1391855 is a deficient number, since it is larger than the sum of its proper divisors (343177).

1391855 is an equidigital number, since it uses as much as digits as its factorization.

1391855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 365 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 1391855 is about 1179.7690451949. The cubic root of 1391855 is about 111.6515263748.

The spelling of 1391855 in words is "one million, three hundred ninety-one thousand, eight hundred fifty-five".