2491438734 has 48 divisors (see below), whose sum is σ = 5648696352. Its totient is φ = 792777024.

The previous prime is 2491438717. The next prime is 2491438739. The reversal of 2491438734 is 4378341942.

It is a self number, because there is not a number n which added to its sum of digits gives 2491438734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491438739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7 + ... + 70589.

It is an arithmetic number, because the mean of its divisors is an integer number (117681174).

Almost surely, 2^2491438734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2491438734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2824348176).

2491438734 is an abundant number, since it is smaller than the sum of its proper divisors (3157257618).

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

2491438734 is a wasteful number, since it uses less digits than its factorization.

2491438734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70681 (or 70678 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 2491438734 is about 49914.3139189552. The cubic root of 2491438734 is about 1355.6577796953.

The spelling of 2491438734 in words is "two billion, four hundred ninety-one million, four hundred thirty-eight thousand, seven hundred thirty-four".