1394435840 has 144 divisors (see below), whose sum is σ = 4018667520. Its totient is φ = 452874240.

The previous prime is 1394435839. The next prime is 1394435843. The reversal of 1394435840 is 485344931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1394435843) 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 15 ways as a sum of consecutive naturals, for example, 166145 + ... + 174335.

Almost surely, 2^1394435840 is an apocalyptic number.

1394435840 is a gapful number since it is divisible by the number (10) 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 1394435840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2009333760).

1394435840 is an abundant number, since it is smaller than the sum of its proper divisors (2624231680).

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

1394435840 is an equidigital number, since it uses as much as digits as its factorization.

1394435840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8238 (or 8224 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 41.

The square root of 1394435840 is about 37342.1456266241. The cubic root of 1394435840 is about 1117.2049352188.

Subtracting from 1394435840 its reverse (485344931), we obtain a palindrome (909090909).

The spelling of 1394435840 in words is "one billion, three hundred ninety-four million, four hundred thirty-five thousand, eight hundred forty".