1187021 has 12 divisors (see below), whose sum is σ = 1359744. Its totient is φ = 1026600.

The previous prime is 1187009. The next prime is 1187023. The reversal of 1187021 is 1207811.

It is not a de Polignac number, because 1187021 - 2¹⁰ = 1185997 is a prime.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1186984 and 1187002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20090 + ... + 20148.

It is an arithmetic number, because the mean of its divisors is an integer number (113312).

2^1187021 is an apocalyptic number.

1187021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1187021 is a deficient number, since it is larger than the sum of its proper divisors (172723).

1187021 is an equidigital number, since it uses as much as digits as its factorization.

1187021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1187021 is about 1089.5049334445. The cubic root of 1187021 is about 105.8813493793.

The spelling of 1187021 in words is "one million, one hundred eighty-seven thousand, twenty-one".