1098987 has 4 divisors (see below), whose sum is σ = 1465320. Its totient is φ = 732656.

The previous prime is 1098973. The next prime is 1098989. The reversal of 1098987 is 7898901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7898901 = 3 ⋅2632967.

It is a cyclic number.

It is not a de Polignac number, because 1098987 - 2⁸ = 1098731 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (1098989) 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, 183162 + ... + 183167.

It is an arithmetic number, because the mean of its divisors is an integer number (366330).

2^1098987 is an apocalyptic number.

1098987 is a deficient number, since it is larger than the sum of its proper divisors (366333).

1098987 is an equidigital number, since it uses as much as digits as its factorization.

1098987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366332.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1098987 is about 1048.3258081341. The cubic root of 1098987 is about 103.1963139420.

The spelling of 1098987 in words is "one million, ninety-eight thousand, nine hundred eighty-seven".