1493387821 has 16 divisors (see below), whose sum is σ = 1617006400. Its totient is φ = 1374392448.

The previous prime is 1493387809. The next prime is 1493387839. The reversal of 1493387821 is 1287833941.

It is a cyclic number.

It is not a de Polignac number, because 1493387821 - 2²⁷ = 1359170093 is a prime.

It is a super-2 number, since 2×1493387821² = 4460414367822256082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1493387221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 602641 + ... + 605113.

It is an arithmetic number, because the mean of its divisors is an integer number (101062900).

Almost surely, 2^1493387821 is an apocalyptic number.

It is an amenable number.

1493387821 is a deficient number, since it is larger than the sum of its proper divisors (123618579).

1493387821 is a wasteful number, since it uses less digits than its factorization.

1493387821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3388.

The product of its digits is 290304, while the sum is 46.

The square root of 1493387821 is about 38644.3763179069. The cubic root of 1493387821 is about 1143.0297526513.

The spelling of 1493387821 in words is "one billion, four hundred ninety-three million, three hundred eighty-seven thousand, eight hundred twenty-one".