1491703138 has 16 divisors (see below), whose sum is σ = 2277540864. Its totient is φ = 732639600.

The previous prime is 1491703133. The next prime is 1491703163. The reversal of 1491703138 is 8313071941.

It is a junction number, because it is equal to n+sod(n) for n = 1491703097 and 1491703106.

It is not an unprimeable number, because it can be changed into a prime (1491703133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3420 + ... + 54727.

It is an arithmetic number, because the mean of its divisors is an integer number (142346304).

Almost surely, 2^1491703138 is an apocalyptic number.

1491703138 is a deficient number, since it is larger than the sum of its proper divisors (785837726).

1491703138 is a wasteful number, since it uses less digits than its factorization.

1491703138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58377.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1491703138 is about 38622.5729075627. The cubic root of 1491703138 is about 1142.5997756280.

The spelling of 1491703138 in words is "one billion, four hundred ninety-one million, seven hundred three thousand, one hundred thirty-eight".