140256649 has 9 divisors (see below), whose sum is σ = 152042439. Its totient is φ = 129325560.

The previous prime is 140256643. The next prime is 140256653. The reversal of 140256649 is 946652041.

The square root of 140256649 is 11843.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 119508624 = 4555^2 + 10932^2 .

It is not a de Polignac number, because 140256649 - 2¹⁹ = 139732361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140256643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 153504 + ... + 154414.

Almost surely, 2^140256649 is an apocalyptic number.

140256649 is the 11843-rd square number.

140256649 is the 5922-nd centered octagonal number.

It is an amenable number.

140256649 is a deficient number, since it is larger than the sum of its proper divisors (11785790).

140256649 is an frugal number, since it uses more digits than its factorization.

140256649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1848 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The cubic root of 140256649 is about 519.5665137344.

The spelling of 140256649 in words is "one hundred forty million, two hundred fifty-six thousand, six hundred forty-nine".