1090987 has 4 divisors (see below), whose sum is σ = 1093120. Its totient is φ = 1088856.

The previous prime is 1090979. The next prime is 1090997. The reversal of 1090987 is 7890901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890901 = 41 ⋅192461.

It is a 3-Lehmer number, since φ(1090987) divides (1090987-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1090987 - 2³ = 1090979 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1090927) 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, 214 + ... + 1492.

It is an arithmetic number, because the mean of its divisors is an integer number (273280).

2^1090987 is an apocalyptic number.

1090987 is the 853-rd pentagonal number.

1090987 is a deficient number, since it is larger than the sum of its proper divisors (2133).

1090987 is an equidigital number, since it uses as much as digits as its factorization.

1090987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1090987 is about 1044.5032312061. The cubic root of 1090987 is about 102.9453003934.

The spelling of 1090987 in words is "one million, ninety thousand, nine hundred eighty-seven".