1187421 has 8 divisors (see below), whose sum is σ = 1652160. Its totient is φ = 757152.

The previous prime is 1187419. The next prime is 1187429. The reversal of 1187421 is 1247811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1187421 - 2¹ = 1187419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1187391 and 1187400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8536 + ... + 8673.

It is an arithmetic number, because the mean of its divisors is an integer number (206520).

2^1187421 is an apocalyptic number.

It is an amenable number.

1187421 is a deficient number, since it is larger than the sum of its proper divisors (464739).

1187421 is a wasteful number, since it uses less digits than its factorization.

1187421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17235.

The product of its digits is 448, while the sum is 24.

The square root of 1187421 is about 1089.6884875963. The cubic root of 1187421 is about 105.8932412732.

The spelling of 1187421 in words is "one million, one hundred eighty-seven thousand, four hundred twenty-one".