2040400069 has 2 divisors, whose sum is σ = 2040400070. Its totient is φ = 2040400068.

The previous prime is 2040400051. The next prime is 2040400079. The reversal of 2040400069 is 9600040402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2032837569 + 7562500 = 45087^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040400069 - 2⁷ = 2040399941 is a prime.

It is a super-2 number, since 2×2040400069² = 8326464883150409522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2040400079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020200034 + 1020200035.

It is an arithmetic number, because the mean of its divisors is an integer number (1020200035).

Almost surely, 2^2040400069 is an apocalyptic number.

It is an amenable number.

2040400069 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040400069 is an equidigital number, since it uses as much as digits as its factorization.

2040400069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2040400069 is about 45170.7877836993. The cubic root of 2040400069 is about 1268.3480431034.

The spelling of 2040400069 in words is "two billion, forty million, four hundred thousand, sixty-nine".