1402440409 has 2 divisors, whose sum is σ = 1402440410. Its totient is φ = 1402440408.

The previous prime is 1402440397. The next prime is 1402440419. The reversal of 1402440409 is 9040442041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1290821184 + 111619225 = 35928^2 + 10565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1402440409 - 2¹³ = 1402432217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1402440419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701220204 + 701220205.

It is an arithmetic number, because the mean of its divisors is an integer number (701220205).

Almost surely, 2^1402440409 is an apocalyptic number.

It is an amenable number.

1402440409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402440409 is an equidigital number, since it uses as much as digits as its factorization.

1402440409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1402440409 is about 37449.1710055109. The cubic root of 1402440409 is about 1119.3385786997.

The spelling of 1402440409 in words is "one billion, four hundred two million, four hundred forty thousand, four hundred nine".