1491712040 has 128 divisors (see below), whose sum is σ = 4348512000. Its totient is φ = 447234048.

The previous prime is 1491712037. The next prime is 1491712069. The reversal of 1491712040 is 402171941.

It is a junction number, because it is equal to n+sod(n) for n = 1491711994 and 1491712012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58376 + ... + 79944.

It is an arithmetic number, because the mean of its divisors is an integer number (33972750).

Almost surely, 2^1491712040 is an apocalyptic number.

1491712040 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 1491712040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174256000).

1491712040 is an abundant number, since it is smaller than the sum of its proper divisors (2856799960).

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

1491712040 is a wasteful number, since it uses less digits than its factorization.

1491712040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21619 (or 21615 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1491712040 is about 38622.6881508784. The cubic root of 1491712040 is about 1142.6020485117.

Adding to 1491712040 its reverse (402171941), we get a palindrome (1893883981).

The spelling of 1491712040 in words is "one billion, four hundred ninety-one million, seven hundred twelve thousand, forty".