1491938720 has 24 divisors (see below), whose sum is σ = 3524705604. Its totient is φ = 596775424.

The previous prime is 1491938681. The next prime is 1491938731. The reversal of 1491938720 is 278391941.

It can be written as a sum of positive squares in 2 ways, for example, as 1483482256 + 8456464 = 38516^2 + 2908^2 .

It is a super-2 number, since 2×1491938720² = 4451762288470476800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4662149 + ... + 4662468.

Almost surely, 2^1491938720 is an apocalyptic number.

1491938720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1491938720 is an abundant number, since it is smaller than the sum of its proper divisors (2032766884).

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

1491938720 is an equidigital number, since it uses as much as digits as its factorization.

1491938720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9324632 (or 9324624 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1491938720 is about 38625.6225839791. The cubic root of 1491938720 is about 1142.6599220393.

The spelling of 1491938720 in words is "one billion, four hundred ninety-one million, nine hundred thirty-eight thousand, seven hundred twenty".