140243654 has 4 divisors (see below), whose sum is σ = 210365484. Its totient is φ = 70121826.

The previous prime is 140243647. The next prime is 140243699. The reversal of 140243654 is 456342041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 456342041 = 31 ⋅14720711.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35060912 + ... + 35060915.

It is an arithmetic number, because the mean of its divisors is an integer number (52591371).

Almost surely, 2^140243654 is an apocalyptic number.

140243654 is a deficient number, since it is larger than the sum of its proper divisors (70121830).

140243654 is an equidigital number, since it uses as much as digits as its factorization.

140243654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70121829.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 140243654 is about 11842.4513509662. The cubic root of 140243654 is about 519.5504670195.

Adding to 140243654 its reverse (456342041), we get a palindrome (596585695).

The spelling of 140243654 in words is "one hundred forty million, two hundred forty-three thousand, six hundred fifty-four".