140818644 has 36 divisors (see below), whose sum is σ = 359491860. Its totient is φ = 46473600.

The previous prime is 140818637. The next prime is 140818649. The reversal of 140818644 is 446818041.

140818644 is a `hidden beast` number, since 1 + 4 + 0 + 8 + 1 + 8 + 644 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70056900 + 70761744 = 8370^2 + 8412^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 140818599 and 140818608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140818649) 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, 15729 + ... + 23000.

It is an arithmetic number, because the mean of its divisors is an integer number (9985885).

Almost surely, 2^140818644 is an apocalyptic number.

It is an amenable number.

140818644 is an abundant number, since it is smaller than the sum of its proper divisors (218673216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140818644 is a wasteful number, since it uses less digits than its factorization.

140818644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38840 (or 38835 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 140818644 is about 11866.7031647379. The cubic root of 140818644 is about 520.2595400632.

The spelling of 140818644 in words is "one hundred forty million, eight hundred eighteen thousand, six hundred forty-four".