2418721 has 2 divisors, whose sum is σ = 2418722. Its totient is φ = 2418720.

The previous prime is 2418701. The next prime is 2418733. The reversal of 2418721 is 1278142.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1535121 + 883600 = 1239^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 2418721 - 2¹⁵ = 2385953 is a prime.

It is a super-2 number, since 2×2418721² = 11700422551682, which contains 22 as substring.

2418721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2418701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1209360 + 1209361.

It is an arithmetic number, because the mean of its divisors is an integer number (1209361).

2^2418721 is an apocalyptic number.

It is an amenable number.

2418721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2418721 is an equidigital number, since it uses as much as digits as its factorization.

2418721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 2418721 is about 1555.2237781104. The cubic root of 2418721 is about 134.2338124781.

The spelling of 2418721 in words is "two million, four hundred eighteen thousand, seven hundred twenty-one".