1240999 has 2 divisors, whose sum is σ = 1241000. Its totient is φ = 1240998.

The previous prime is 1240991. The next prime is 1241003. The reversal of 1240999 is 9990421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240999 - 2³ = 1240991 is a prime.

1240999 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620499 + 620500.

It is an arithmetic number, because the mean of its divisors is an integer number (620500).

2^1240999 is an apocalyptic number.

1240999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240999 is an equidigital number, since it uses as much as digits as its factorization.

1240999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1240999 is about 1114.0013464983. The cubic root of 1240999 is about 107.4625505032.

The spelling of 1240999 in words is "one million, two hundred forty thousand, nine hundred ninety-nine".