7487981 has 4 divisors (see below), whose sum is σ = 7502364. Its totient is φ = 7473600.

The previous prime is 7487969. The next prime is 7487989. The reversal of 7487981 is 1897847.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2669956 + 4818025 = 1634^2 + 2195^2 .

It is a cyclic number.

It is not a de Polignac number, because 7487981 - 2⁶ = 7487917 is a prime.

It is a super-2 number, since 2×7487981² = 112139718912722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7487989) 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, 6380 + ... + 7461.

It is an arithmetic number, because the mean of its divisors is an integer number (1875591).

Almost surely, 2^7487981 is an apocalyptic number.

It is an amenable number.

7487981 is a deficient number, since it is larger than the sum of its proper divisors (14383).

7487981 is a wasteful number, since it uses less digits than its factorization.

7487981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14382.

The product of its digits is 112896, while the sum is 44.

The square root of 7487981 is about 2736.4175485477. The cubic root of 7487981 is about 195.6387643892.

The spelling of 7487981 in words is "seven million, four hundred eighty-seven thousand, nine hundred eighty-one".