1987515 has 24 divisors (see below), whose sum is σ = 3566160. Its totient is φ = 1022784.

The previous prime is 1987501. The next prime is 1987519. The reversal of 1987515 is 5157891.

It is not a de Polignac number, because 1987515 - 2⁵ = 1987483 is a prime.

It is a super-3 number, since 3×1987515³ = 23553339915743447625, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1987515.

It is not an unprimeable number, because it can be changed into a prime (1987519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544 + ... + 2066.

It is an arithmetic number, because the mean of its divisors is an integer number (148590).

2^1987515 is an apocalyptic number.

1987515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1987515 is a deficient number, since it is larger than the sum of its proper divisors (1578645).

1987515 is a wasteful number, since it uses less digits than its factorization.

1987515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1560 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The square root of 1987515 is about 1409.7925379289. The cubic root of 1987515 is about 125.7293889888.

The spelling of 1987515 in words is "one million, nine hundred eighty-seven thousand, five hundred fifteen".