2400661 has 2 divisors, whose sum is σ = 2400662. Its totient is φ = 2400660.

The previous prime is 2400623. The next prime is 2400667. The reversal of 2400661 is 1660042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 1168561 = 1110^2 + 1081^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400661 - 2¹³ = 2392469 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2400667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1200330 + 1200331.

It is an arithmetic number, because the mean of its divisors is an integer number (1200331).

2^2400661 is an apocalyptic number.

It is an amenable number.

2400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2400661 is an equidigital number, since it uses as much as digits as its factorization.

2400661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2400661 is about 1549.4066606285. The cubic root of 2400661 is about 133.8988804210.

The spelling of 2400661 in words is "two million, four hundred thousand, six hundred sixty-one".