1491225984 has 192 divisors, whose sum is σ = 4557870000. Its totient is φ = 479969280.

The previous prime is 1491225973. The next prime is 1491225991. The reversal of 1491225984 is 4895221941.

It is a happy number.

1491225984 is a `hidden beast` number, since 1 + 49 + 12 + 2 + 598 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3320992 + ... + 3321440.

Almost surely, 2^1491225984 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 1491225984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2278935000).

1491225984 is an abundant number, since it is smaller than the sum of its proper divisors (3066644016).

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

1491225984 is an equidigital number, since it uses as much as digits as its factorization.

1491225984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 485 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 1491225984 is about 38616.3952745463. The cubic root of 1491225984 is about 1142.4779340943.

It can be divided in two parts, 1491 and 225984, that added together give a triangular number (227475 = T₆₇₄).

The spelling of 1491225984 in words is "one billion, four hundred ninety-one million, two hundred twenty-five thousand, nine hundred eighty-four".