1491546420 has 384 divisors, whose sum is σ = 5780275200. Its totient is φ = 310915584.

The previous prime is 1491546401. The next prime is 1491546449. The reversal of 1491546420 is 246451941.

1491546420 is a `hidden beast` number, since 1 + 4 + 9 + 1 + 5 + 4 + 642 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6240661 + ... + 6240899.

It is an arithmetic number, because the mean of its divisors is an integer number (15052800).

Almost surely, 2^1491546420 is an apocalyptic number.

1491546420 is a gapful number since it is divisible by the number (10) 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 1491546420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2890137600).

1491546420 is an abundant number, since it is smaller than the sum of its proper divisors (4288728780).

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

1491546420 is a wasteful number, since it uses less digits than its factorization.

1491546420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1491546420 is about 38620.5440148116. The cubic root of 1491546420 is about 1142.5597604672.

The spelling of 1491546420 in words is "one billion, four hundred ninety-one million, five hundred forty-six thousand, four hundred twenty".