1487831721 has 8 divisors (see below), whose sum is σ = 2100468384. Its totient is φ = 933541440.

The previous prime is 1487831699. The next prime is 1487831729. The reversal of 1487831721 is 1271387841.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1487831721 - 2¹³ = 1487823529 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1487831729) 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, 14586535 + ... + 14586636.

It is an arithmetic number, because the mean of its divisors is an integer number (262558548).

Almost surely, 2^1487831721 is an apocalyptic number.

It is an amenable number.

1487831721 is a deficient number, since it is larger than the sum of its proper divisors (612636663).

1487831721 is a wasteful number, since it uses less digits than its factorization.

1487831721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29173191.

The product of its digits is 75264, while the sum is 42.

The square root of 1487831721 is about 38572.4217673716. The cubic root of 1487831721 is about 1141.6104562471.

The spelling of 1487831721 in words is "one billion, four hundred eighty-seven million, eight hundred thirty-one thousand, seven hundred twenty-one".