140440669 has 2 divisors, whose sum is σ = 140440670. Its totient is φ = 140440668.

The previous prime is 140440639. The next prime is 140440673. The reversal of 140440669 is 966044041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80192025 + 60248644 = 8955^2 + 7762^2 .

It is a cyclic number.

It is not a de Polignac number, because 140440669 - 2⁷ = 140440541 is a prime.

It is a super-2 number, since 2×140440669² = 39447163018335122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140440639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70220334 + 70220335.

It is an arithmetic number, because the mean of its divisors is an integer number (70220335).

Almost surely, 2^140440669 is an apocalyptic number.

It is an amenable number.

140440669 is a deficient number, since it is larger than the sum of its proper divisors (1).

140440669 is an equidigital number, since it uses as much as digits as its factorization.

140440669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 140440669 is about 11850.7665996762. The cubic root of 140440669 is about 519.7936422319.

The spelling of 140440669 in words is "one hundred forty million, four hundred forty thousand, six hundred sixty-nine".