140688457 has 12 divisors (see below), whose sum is σ = 176247876. Its totient is φ = 111313440.

The previous prime is 140688377. The next prime is 140688461. The reversal of 140688457 is 754886041.

It can be written as a sum of positive squares in 2 ways, for example, as 88906041 + 51782416 = 9429^2 + 7196^2 .

It is not a de Polignac number, because 140688457 - 2²⁷ = 6470729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (140688487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109794 + ... + 111067.

It is an arithmetic number, because the mean of its divisors is an integer number (14687323).

Almost surely, 2^140688457 is an apocalyptic number.

It is an amenable number.

140688457 is a deficient number, since it is larger than the sum of its proper divisors (35559419).

140688457 is a wasteful number, since it uses less digits than its factorization.

140688457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220888 (or 220881 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 140688457 is about 11861.2165059070. The cubic root of 140688457 is about 520.0991637806.

The spelling of 140688457 in words is "one hundred forty million, six hundred eighty-eight thousand, four hundred fifty-seven".