7987431 has 4 divisors (see below), whose sum is σ = 10649912. Its totient is φ = 5324952.

The previous prime is 7987423. The next prime is 7987439. The reversal of 7987431 is 1347897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1347897 = 3 ⋅449299.

It is an interprime number because it is at equal distance from previous prime (7987423) and next prime (7987439).

It is not a de Polignac number, because 7987431 - 2³ = 7987423 is a prime.

It is a super-2 number, since 2×7987431² = 127598107959522, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7⁶ + 9⁴ + 8⁷ + 7⁸ + 4⁵ + 3⁵ + 1 .

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 7987431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987439) 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, 1331236 + ... + 1331241.

It is an arithmetic number, because the mean of its divisors is an integer number (2662478).

Almost surely, 2^7987431 is an apocalyptic number.

7987431 is a deficient number, since it is larger than the sum of its proper divisors (2662481).

7987431 is a wasteful number, since it uses less digits than its factorization.

7987431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662480.

The product of its digits is 42336, while the sum is 39.

The square root of 7987431 is about 2826.2043450536. The cubic root of 7987431 is about 199.8952034313.

The spelling of 7987431 in words is "seven million, nine hundred eighty-seven thousand, four hundred thirty-one".