1391955552 has 288 divisors, whose sum is σ = 4491002880. Its totient is φ = 406010880.

The previous prime is 1391955547. The next prime is 1391955569. The reversal of 1391955552 is 2555591931.

1391955552 is a `hidden beast` number, since 1 + 3 + 9 + 1 + 95 + 5 + 552 = 666.

1391955552 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (288).

It is a junction number, because it is equal to n+sod(n) for n = 1391955498 and 1391955507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7776199 + ... + 7776377.

It is an arithmetic number, because the mean of its divisors is an integer number (15593760).

Almost surely, 2^1391955552 is an apocalyptic number.

1391955552 is a gapful number since it is divisible by the number (12) 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 1391955552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2245501440).

1391955552 is an abundant number, since it is smaller than the sum of its proper divisors (3099047328).

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

1391955552 is a wasteful number, since it uses less digits than its factorization.

1391955552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 295 counting only the distinct ones).

The product of its digits is 303750, while the sum is 45.

The square root of 1391955552 is about 37308.9205418758. The cubic root of 1391955552 is about 1116.5421499634.

The spelling of 1391955552 in words is "one billion, three hundred ninety-one million, nine hundred fifty-five thousand, five hundred fifty-two".