1391868 has 54 divisors (see below), whose sum is σ = 3763032. Its totient is φ = 432960.

The previous prime is 1391861. The next prime is 1391893. The reversal of 1391868 is 8681931.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33928 + ... + 33968.

2^1391868 is an apocalyptic number.

1391868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881516).

1391868 is an abundant number, since it is smaller than the sum of its proper divisors (2371164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391868 is a wasteful number, since it uses less digits than its factorization.

1391868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 69 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1391868 is about 1179.7745547349. The cubic root of 1391868 is about 111.6518739841.

The spelling of 1391868 in words is "one million, three hundred ninety-one thousand, eight hundred sixty-eight".