1155421 has 4 divisors (see below), whose sum is σ = 1183644. Its totient is φ = 1127200.

The previous prime is 1155419. The next prime is 1155431. The reversal of 1155421 is 1245511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1245511 = 191 ⋅6521.

It can be written as a sum of positive squares in 2 ways, for example, as 532900 + 622521 = 730^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155421 - 2¹ = 1155419 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 (1155431) 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, 14050 + ... + 14131.

It is an arithmetic number, because the mean of its divisors is an integer number (295911).

2^1155421 is an apocalyptic number.

It is an amenable number.

1155421 is a deficient number, since it is larger than the sum of its proper divisors (28223).

1155421 is an equidigital number, since it uses as much as digits as its factorization.

1155421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28222.

The product of its digits is 200, while the sum is 19.

The square root of 1155421 is about 1074.9051120913. The cubic root of 1155421 is about 104.9333212332.

The spelling of 1155421 in words is "one million, one hundred fifty-five thousand, four hundred twenty-one".