126840637 has 32 divisors (see below), whose sum is σ = 167731200. Its totient is φ = 92923200.

The previous prime is 126840589. The next prime is 126840641. The reversal of 126840637 is 736048621.

It is a cyclic number.

It is not a de Polignac number, because 126840637 - 2⁷ = 126840509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126840596 and 126840605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126840647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264564 + ... + 265042.

It is an arithmetic number, because the mean of its divisors is an integer number (5241600).

Almost surely, 2^126840637 is an apocalyptic number.

It is an amenable number.

126840637 is a deficient number, since it is larger than the sum of its proper divisors (40890563).

126840637 is a wasteful number, since it uses less digits than its factorization.

126840637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 126840637 is about 11262.3548603301. The cubic root of 126840637 is about 502.4422342283.

It can be divided in two parts, 1268 and 40637, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 126840637 in words is "one hundred twenty-six million, eight hundred forty thousand, six hundred thirty-seven".