1358209944 has 320 divisors, whose sum is σ = 4839690240. Its totient is φ = 346187520.

The previous prime is 1358209939. The next prime is 1358209969. The reversal of 1358209944 is 4499028531.

1358209944 is a `hidden beast` number, since 1 + 358 + 209 + 94 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1358209944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1827637 + ... + 1828379.

It is an arithmetic number, because the mean of its divisors is an integer number (15124032).

Almost surely, 2^1358209944 is an apocalyptic number.

1358209944 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 1358209944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2419845120).

1358209944 is an abundant number, since it is smaller than the sum of its proper divisors (3481480296).

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

1358209944 is a wasteful number, since it uses less digits than its factorization.

1358209944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1358209944 is about 36853.8999835838. The cubic root of 1358209944 is about 1107.4453448630.

The spelling of 1358209944 in words is "one billion, three hundred fifty-eight million, two hundred nine thousand, nine hundred forty-four".