1391235456 has 128 divisors (see below), whose sum is σ = 4000399200. Its totient is φ = 425852928.

The previous prime is 1391235413. The next prime is 1391235487. The reversal of 1391235456 is 6545321931.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1142560 + ... + 1143776.

Almost surely, 2^1391235456 is an apocalyptic number.

1391235456 is a gapful number since it is divisible by the number (16) 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 1391235456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2000199600).

1391235456 is an abundant number, since it is smaller than the sum of its proper divisors (2609163744).

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

1391235456 is a wasteful number, since it uses less digits than its factorization.

1391235456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1476 (or 1464 counting only the distinct ones).

The product of its digits is 97200, while the sum is 39.

The square root of 1391235456 is about 37299.2688400188. The cubic root of 1391235456 is about 1116.3495776691.

The spelling of 1391235456 in words is "one billion, three hundred ninety-one million, two hundred thirty-five thousand, four hundred fifty-six".