1487981 has 4 divisors (see below), whose sum is σ = 1623264. Its totient is φ = 1352700.

The previous prime is 1487977. The next prime is 1487987. The reversal of 1487981 is 1897841.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1487981 - 2² = 1487977 is a prime.

It is a super-2 number, since 2×1487981² = 4428174912722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1487987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67625 + ... + 67646.

It is an arithmetic number, because the mean of its divisors is an integer number (405816).

2^1487981 is an apocalyptic number.

1487981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1487981 is a deficient number, since it is larger than the sum of its proper divisors (135283).

1487981 is a wasteful number, since it uses less digits than its factorization.

1487981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135282.

The product of its digits is 16128, while the sum is 38.

The square root of 1487981 is about 1219.8282666015. The cubic root of 1487981 is about 114.1648635468.

The spelling of 1487981 in words is "one million, four hundred eighty-seven thousand, nine hundred eighty-one".