1487939981 has 8 divisors (see below), whose sum is σ = 1623674784. Its totient is φ = 1352283120.

The previous prime is 1487939963. The next prime is 1487939993. The reversal of 1487939981 is 1899397841.

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

It is a cyclic number.

It is not a de Polignac number, because 1487939981 - 2²² = 1483745677 is a prime.

It is a super-2 number, since 2×1487939981² = 4427930774116560722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1487939981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1487939911) 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 7 ways as a sum of consecutive naturals, for example, 24830 + ... + 59936.

It is an arithmetic number, because the mean of its divisors is an integer number (202959348).

Almost surely, 2^1487939981 is an apocalyptic number.

1487939981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1487939981 is a deficient number, since it is larger than the sum of its proper divisors (135734803).

1487939981 is a wasteful number, since it uses less digits than its factorization.

1487939981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38971.

The product of its digits is 3919104, while the sum is 59.

The square root of 1487939981 is about 38573.8250760798. The cubic root of 1487939981 is about 1141.6381448064.

The spelling of 1487939981 in words is "one billion, four hundred eighty-seven million, nine hundred thirty-nine thousand, nine hundred eighty-one".