1491902720 has 144 divisors (see below), whose sum is σ = 4455658368. Its totient is φ = 464977920.

The previous prime is 1491902701. The next prime is 1491902723. The reversal of 1491902720 is 272091941.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1491902723) by changing a digit.

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, 90992 + ... + 106128.

It is an arithmetic number, because the mean of its divisors is an integer number (30942072).

Almost surely, 2^1491902720 is an apocalyptic number.

1491902720 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 1491902720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2227829184).

1491902720 is an abundant number, since it is smaller than the sum of its proper divisors (2963755648).

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

1491902720 is a wasteful number, since it uses less digits than its factorization.

1491902720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15176 (or 15162 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 1491902720 is about 38625.1565692620. The cubic root of 1491902720 is about 1142.6507312937.

The spelling of 1491902720 in words is "one billion, four hundred ninety-one million, nine hundred two thousand, seven hundred twenty".