1491387456 has 112 divisors (see below), whose sum is σ = 4340254464. Its totient is φ = 449089536.

The previous prime is 1491387449. The next prime is 1491387481. The reversal of 1491387456 is 6547831941.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110956 + ... + 123668.

It is an arithmetic number, because the mean of its divisors is an integer number (38752272).

Almost surely, 2^1491387456 is an apocalyptic number.

1491387456 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 1491387456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2170127232).

1491387456 is an abundant number, since it is smaller than the sum of its proper divisors (2848867008).

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

1491387456 is a wasteful number, since it uses less digits than its factorization.

1491387456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12788 (or 12778 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 1491387456 is about 38618.4859361420. The cubic root of 1491387456 is about 1142.5191689666.

The spelling of 1491387456 in words is "one billion, four hundred ninety-one million, three hundred eighty-seven thousand, four hundred fifty-six".