140656399 has 4 divisors (see below), whose sum is σ = 151476136. Its totient is φ = 129836664.

The previous prime is 140656361. The next prime is 140656427. The reversal of 140656399 is 993656041.

140656399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993656041 = 7 ⋅141950863.

It is a cyclic number.

It is not a de Polignac number, because 140656399 - 2²³ = 132267791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140656319) 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, 5409849 + ... + 5409874.

It is an arithmetic number, because the mean of its divisors is an integer number (37869034).

Almost surely, 2^140656399 is an apocalyptic number.

140656399 is a deficient number, since it is larger than the sum of its proper divisors (10819737).

140656399 is a wasteful number, since it uses less digits than its factorization.

140656399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10819736.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 140656399 is about 11859.8650498224. The cubic root of 140656399 is about 520.0596566172.

The spelling of 140656399 in words is "one hundred forty million, six hundred fifty-six thousand, three hundred ninety-nine".