140064257 has 4 divisors (see below), whose sum is σ = 147436080. Its totient is φ = 132692436.

The previous prime is 140064251. The next prime is 140064259. The reversal of 140064257 is 752460041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 140064257 - 2⁶ = 140064193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140064251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3685883 + ... + 3685920.

It is an arithmetic number, because the mean of its divisors is an integer number (36859020).

Almost surely, 2^140064257 is an apocalyptic number.

It is an amenable number.

140064257 is a deficient number, since it is larger than the sum of its proper divisors (7371823).

140064257 is an equidigital number, since it uses as much as digits as its factorization.

140064257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371822.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 140064257 is about 11834.8746085457. The cubic root of 140064257 is about 519.3288394851.

The spelling of 140064257 in words is "one hundred forty million, sixty-four thousand, two hundred fifty-seven".