1870987 has 4 divisors (see below), whose sum is σ = 1969480. Its totient is φ = 1772496.

The previous prime is 1870961. The next prime is 1870991. The reversal of 1870987 is 7890781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7890781 = 2029 ⋅3889.

It is a cyclic number.

It is not a de Polignac number, because 1870987 - 2⁷ = 1870859 is a prime.

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

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1870907) 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, 49218 + ... + 49255.

It is an arithmetic number, because the mean of its divisors is an integer number (492370).

2^1870987 is an apocalyptic number.

1870987 is a deficient number, since it is larger than the sum of its proper divisors (98493).

1870987 is an equidigital number, since it uses as much as digits as its factorization.

1870987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98492.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1870987 is about 1367.8402684524. The cubic root of 1870987 is about 123.2225683553. Note that the first 3 decimals are identical.

The spelling of 1870987 in words is "one million, eight hundred seventy thousand, nine hundred eighty-seven".