140087781 has 24 divisors (see below), whose sum is σ = 207641720. Its totient is φ = 90979200.

The previous prime is 140087767. The next prime is 140087789. The reversal of 140087781 is 187780041.

It can be written as a sum of positive squares in 4 ways, for example, as 9922500 + 130165281 = 3150^2 + 11409^2 .

It is not a de Polignac number, because 140087781 - 2⁵ = 140087749 is a prime.

It is a super-2 number, since 2×140087781² = 39249172771007922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140087789) 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 in 23 ways as a sum of consecutive naturals, for example, 58671 + ... + 61011.

Almost surely, 2^140087781 is an apocalyptic number.

It is an amenable number.

140087781 is a deficient number, since it is larger than the sum of its proper divisors (67553939).

140087781 is a wasteful number, since it uses less digits than its factorization.

140087781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517 (or 2514 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 140087781 is about 11835.8684092043. The cubic root of 140087781 is about 519.3579118742.

The spelling of 140087781 in words is "one hundred forty million, eighty-seven thousand, seven hundred eighty-one".