140236469 has 2 divisors, whose sum is σ = 140236470. Its totient is φ = 140236468.

The previous prime is 140236423. The next prime is 140236487. The reversal of 140236469 is 964632041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138886225 + 1350244 = 11785^2 + 1162^2 .

It is a cyclic number.

It is not a de Polignac number, because 140236469 - 2¹² = 140232373 is a prime.

It is a super-2 number, since 2×140236469² = 39332534475175922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140236069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70118234 + 70118235.

It is an arithmetic number, because the mean of its divisors is an integer number (70118235).

Almost surely, 2^140236469 is an apocalyptic number.

It is an amenable number.

140236469 is a deficient number, since it is larger than the sum of its proper divisors (1).

140236469 is an equidigital number, since it uses as much as digits as its factorization.

140236469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 140236469 is about 11842.1479892796. The cubic root of 140236469 is about 519.5415942856.

The spelling of 140236469 in words is "one hundred forty million, two hundred thirty-six thousand, four hundred sixty-nine".