1491699456 has 216 divisors, whose sum is σ = 4780384560. Its totient is φ = 458625024.

The previous prime is 1491699449. The next prime is 1491699491. The reversal of 1491699456 is 6549961941.

1491699456 is a `hidden beast` number, since 1 + 491 + 69 + 94 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1167490 + ... + 1168766.

It is an arithmetic number, because the mean of its divisors is an integer number (22131410).

Almost surely, 2^1491699456 is an apocalyptic number.

1491699456 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 1491699456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390192280).

1491699456 is an abundant number, since it is smaller than the sum of its proper divisors (3288685104).

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

1491699456 is a wasteful number, since it uses less digits than its factorization.

1491699456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1295 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 1491699456 is about 38622.5252411077. The cubic root of 1491699456 is about 1142.5988355268.

The spelling of 1491699456 in words is "one billion, four hundred ninety-one million, six hundred ninety-nine thousand, four hundred fifty-six".