140591999 has 4 divisors (see below), whose sum is σ = 142572240. Its totient is φ = 138611760.

The previous prime is 140591981. The next prime is 140592017. The reversal of 140591999 is 999195041.

It is a happy number.

140591999 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.

It is an interprime number because it is at equal distance from previous prime (140591981) and next prime (140592017).

It is a cyclic number.

It is not a de Polignac number, because 140591999 - 2¹² = 140587903 is a prime.

It is a super-2 number, since 2×140591999² = 39532220365632002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140591909) 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, 990014 + ... + 990155.

It is an arithmetic number, because the mean of its divisors is an integer number (35643060).

Almost surely, 2^140591999 is an apocalyptic number.

140591999 is a deficient number, since it is larger than the sum of its proper divisors (1980241).

140591999 is an equidigital number, since it uses as much as digits as its factorization.

140591999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980240.

The product of its (nonzero) digits is 131220, while the sum is 47.

The square root of 140591999 is about 11857.1496996538. The cubic root of 140591999 is about 519.9802741531.

The spelling of 140591999 in words is "one hundred forty million, five hundred ninety-one thousand, nine hundred ninety-nine".