140618639 has 16 divisors (see below), whose sum is σ = 169524480. Its totient is φ = 113944320.

The previous prime is 140618623. The next prime is 140618663. The reversal of 140618639 is 936816041.

140618639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 140618639 - 2⁴ = 140618623 is a prime.

It is a super-3 number, since 3×140618639³ (a number of 25 digits) contains 333 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 (140618039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88724 + ... + 90294.

It is an arithmetic number, because the mean of its divisors is an integer number (10595280).

Almost surely, 2^140618639 is an apocalyptic number.

140618639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

140618639 is a deficient number, since it is larger than the sum of its proper divisors (28905841).

140618639 is a wasteful number, since it uses less digits than its factorization.

140618639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 140618639 is about 11858.2730192891. The cubic root of 140618639 is about 520.0131148073.

The spelling of 140618639 in words is "one hundred forty million, six hundred eighteen thousand, six hundred thirty-nine".