140105781 has 16 divisors (see below), whose sum is σ = 210129920. Its totient is φ = 93402396.

The previous prime is 140105767. The next prime is 140105783. The reversal of 140105781 is 187501041.

It is not a de Polignac number, because 140105781 - 2¹³ = 140097589 is a prime.

It is a super-2 number, since 2×140105781² = 39259259739239922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140105783) 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 15 ways as a sum of consecutive naturals, for example, 29845 + ... + 34218.

It is an arithmetic number, because the mean of its divisors is an integer number (13133120).

Almost surely, 2^140105781 is an apocalyptic number.

It is an amenable number.

140105781 is a deficient number, since it is larger than the sum of its proper divisors (70024139).

140105781 is an frugal number, since it uses more digits than its factorization.

140105781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64084 (or 64066 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 140105781 is about 11836.6287852581. The cubic root of 140105781 is about 519.3801551705.

It can be divided in two parts, 14010 and 5781, that added together give a palindrome (19791).

The spelling of 140105781 in words is "one hundred forty million, one hundred five thousand, seven hundred eighty-one".