1691294444 has 36 divisors (see below), whose sum is σ = 3467199792. Its totient is φ = 707141760.

The previous prime is 1691294417. The next prime is 1691294491. The reversal of 1691294444 is 4444921961.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1691294395 and 1691294404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29102 + ... + 65034.

Almost surely, 2^1691294444 is an apocalyptic number.

1691294444 is a gapful number since it is divisible by the number (14) 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 1691294444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1733599896).

1691294444 is an abundant number, since it is smaller than the sum of its proper divisors (1775905348).

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

1691294444 is a wasteful number, since it uses less digits than its factorization.

1691294444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36026 (or 35983 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 1691294444 is about 41125.3503814861. The cubic root of 1691294444 is about 1191.4424623750.

The spelling of 1691294444 in words is "one billion, six hundred ninety-one million, two hundred ninety-four thousand, four hundred forty-four".