1391349564 has 288 divisors, whose sum is σ = 4302305280. Its totient is φ = 374169600.

The previous prime is 1391349541. The next prime is 1391349571. The reversal of 1391349564 is 4659431931.

1391349564 is a `hidden beast` number, since 1 + 39 + 13 + 49 + 564 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12312772 + ... + 12312884.

It is an arithmetic number, because the mean of its divisors is an integer number (14938560).

Almost surely, 2^1391349564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391349564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2151152640).

1391349564 is an abundant number, since it is smaller than the sum of its proper divisors (2910955716).

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

1391349564 is a wasteful number, since it uses less digits than its factorization.

1391349564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 236 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 1391349564 is about 37300.7984364946. The cubic root of 1391349564 is about 1116.3800975294.

The spelling of 1391349564 in words is "one billion, three hundred ninety-one million, three hundred forty-nine thousand, five hundred sixty-four".