140256643 has 2 divisors, whose sum is σ = 140256644. Its totient is φ = 140256642.

The previous prime is 140256619. The next prime is 140256653. The reversal of 140256643 is 346652041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140256643 is a prime.

It is not a weakly prime, because it can be changed into another prime (140256653) 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 as a sum of consecutive naturals, namely, 70128321 + 70128322.

It is an arithmetic number, because the mean of its divisors is an integer number (70128322).

Almost surely, 2^140256643 is an apocalyptic number.

140256643 is a deficient number, since it is larger than the sum of its proper divisors (1).

140256643 is an equidigital number, since it uses as much as digits as its factorization.

140256643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 140256643 is about 11842.9997466858. Note that the first 3 decimals coincide. The cubic root of 140256643 is about 519.5665063256.

It can be divided in two parts, 14025 and 6643, that multiplied together give a triangular number (93168075 = T₁₃₆₅₀).

The spelling of 140256643 in words is "one hundred forty million, two hundred fifty-six thousand, six hundred forty-three".