1218741 has 4 divisors (see below), whose sum is σ = 1624992. Its totient is φ = 812492.

The previous prime is 1218739. The next prime is 1218761. The reversal of 1218741 is 1478121.

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: 1478121 = 3 ⋅492707.

It is a cyclic number.

It is not a de Polignac number, because 1218741 - 2¹ = 1218739 is a prime.

It is a D-number.

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

1218741 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218731) 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, 203121 + ... + 203126.

It is an arithmetic number, because the mean of its divisors is an integer number (406248).

2^1218741 is an apocalyptic number.

It is an amenable number.

1218741 is a deficient number, since it is larger than the sum of its proper divisors (406251).

1218741 is an equidigital number, since it uses as much as digits as its factorization.

1218741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406250.

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

The square root of 1218741 is about 1103.9660320861. The cubic root of 1218741 is about 106.8162041090.

The spelling of 1218741 in words is "one million, two hundred eighteen thousand, seven hundred forty-one".