1491757938 has 48 divisors (see below), whose sum is σ = 3643795680. Its totient is φ = 452045880.

The previous prime is 1491757931. The next prime is 1491757987. The reversal of 1491757938 is 8397571941.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1491757931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107620 + ... + 120687.

It is an arithmetic number, because the mean of its divisors is an integer number (75912410).

Almost surely, 2^1491757938 is an apocalyptic number.

1491757938 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1491757938 is an abundant number, since it is smaller than the sum of its proper divisors (2152037742).

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

1491757938 is a wasteful number, since it uses less digits than its factorization.

1491757938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228340 (or 228323 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 1491757938 is about 38623.2823307393. The cubic root of 1491757938 is about 1142.6137671744.

The spelling of 1491757938 in words is "one billion, four hundred ninety-one million, seven hundred fifty-seven thousand, nine hundred thirty-eight".