1187621 has 4 divisors (see below), whose sum is σ = 1190112. Its totient is φ = 1185132.

The previous prime is 1187587. The next prime is 1187623. The reversal of 1187621 is 1267811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1267811 = 293 ⋅4327.

It is a cyclic number.

It is not a de Polignac number, because 1187621 - 2¹⁰ = 1186597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187623) 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, 281 + ... + 1566.

It is an arithmetic number, because the mean of its divisors is an integer number (297528).

2^1187621 is an apocalyptic number.

It is an amenable number.

1187621 is a deficient number, since it is larger than the sum of its proper divisors (2491).

1187621 is an equidigital number, since it uses as much as digits as its factorization.

1187621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490.

The product of its digits is 672, while the sum is 26.

The square root of 1187621 is about 1089.7802530786. The cubic root of 1187621 is about 105.8991862186.

The spelling of 1187621 in words is "one million, one hundred eighty-seven thousand, six hundred twenty-one".