140419781 has 2 divisors, whose sum is σ = 140419782. Its totient is φ = 140419780.

The previous prime is 140419777. The next prime is 140419787. The reversal of 140419781 is 187914041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100300225 + 40119556 = 10015^2 + 6334^2 .

It is a cyclic number.

It is not a de Polignac number, because 140419781 - 2² = 140419777 is a prime.

It is a super-2 number, since 2×140419781² = 39435429792175922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140419787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70209890 + 70209891.

It is an arithmetic number, because the mean of its divisors is an integer number (70209891).

Almost surely, 2^140419781 is an apocalyptic number.

It is an amenable number.

140419781 is a deficient number, since it is larger than the sum of its proper divisors (1).

140419781 is an equidigital number, since it uses as much as digits as its factorization.

140419781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 140419781 is about 11849.8852737062. The cubic root of 140419781 is about 519.7678709981.

The spelling of 140419781 in words is "one hundred forty million, four hundred nineteen thousand, seven hundred eighty-one".