140066781 has 16 divisors (see below), whose sum is σ = 197693760. Its totient is φ = 88058880.

The previous prime is 140066753. The next prime is 140066807. The reversal of 140066781 is 187660041.

It is a happy number.

It is not a de Polignac number, because 140066781 - 2⁵ = 140066749 is a prime.

It is a super-2 number, since 2×140066781² = 39237406279403922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140066681) 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 in 15 ways as a sum of consecutive naturals, for example, 14980 + ... + 22461.

It is an arithmetic number, because the mean of its divisors is an integer number (12355860).

Almost surely, 2^140066781 is an apocalyptic number.

It is an amenable number.

140066781 is a deficient number, since it is larger than the sum of its proper divisors (57626979).

140066781 is a wasteful number, since it uses less digits than its factorization.

140066781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37516.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 140066781 is about 11834.9812420637. The cubic root of 140066781 is about 519.3319589536.

The spelling of 140066781 in words is "one hundred forty million, sixty-six thousand, seven hundred eighty-one".