1391742 has 60 divisors (see below), whose sum is σ = 3476088. Its totient is φ = 415800.

The previous prime is 1391729. The next prime is 1391779. The reversal of 1391742 is 2471931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 19567 + ... + 19637.

2^1391742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1738044).

1391742 is an abundant number, since it is smaller than the sum of its proper divisors (2084346).

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

1391742 is a wasteful number, since it uses less digits than its factorization.

1391742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 87 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1391742 is about 1179.7211534935. The cubic root of 1391742 is about 111.6485047564.

It can be divided in two parts, 139 and 1742, that added together give a palindrome (1881).

The spelling of 1391742 in words is "one million, three hundred ninety-one thousand, seven hundred forty-two".