1491275838 has 96 divisors (see below), whose sum is σ = 3419563392. Its totient is φ = 430920000.

The previous prime is 1491275837. The next prime is 1491275839. The reversal of 1491275838 is 8385721941.

It is an interprime number because it is at equal distance from previous prime (1491275837) and next prime (1491275839).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491275837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5941213 + ... + 5941463.

It is an arithmetic number, because the mean of its divisors is an integer number (35620452).

Almost surely, 2^1491275838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491275838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709781696).

1491275838 is an abundant number, since it is smaller than the sum of its proper divisors (1928287554).

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

1491275838 is a wasteful number, since it uses less digits than its factorization.

1491275838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 499 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 1491275838 is about 38617.0407721772. The cubic root of 1491275838 is about 1142.4906655562.

The spelling of 1491275838 in words is "one billion, four hundred ninety-one million, two hundred seventy-five thousand, eight hundred thirty-eight".