1240020407 has 2 divisors, whose sum is σ = 1240020408. Its totient is φ = 1240020406.

The previous prime is 1240020403. The next prime is 1240020437. The reversal of 1240020407 is 7040200421.

It is a weak prime.

It is an emirp because it is prime and its reverse (7040200421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240020407 - 2² = 1240020403 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240020401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620010203 + 620010204.

It is an arithmetic number, because the mean of its divisors is an integer number (620010204).

Almost surely, 2^1240020407 is an apocalyptic number.

1240020407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240020407 is an equidigital number, since it uses as much as digits as its factorization.

1240020407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 1240020407 is about 35213.9234820547. The cubic root of 1240020407 is about 1074.3429645041.

Adding to 1240020407 its reverse (7040200421), we get a palindrome (8280220828).

The spelling of 1240020407 in words is "one billion, two hundred forty million, twenty thousand, four hundred seven".