140423240 has 16 divisors (see below), whose sum is σ = 315952380. Its totient is φ = 56169280.

The previous prime is 140423207. The next prime is 140423317. The reversal of 140423240 is 42324041.

It can be written as a sum of positive squares in 2 ways, for example, as 138250564 + 2172676 = 11758^2 + 1474^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755251 + ... + 1755330.

Almost surely, 2^140423240 is an apocalyptic number.

140423240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

140423240 is an abundant number, since it is smaller than the sum of its proper divisors (175529140).

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

140423240 is a wasteful number, since it uses less digits than its factorization.

140423240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510592 (or 3510588 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 140423240 is about 11850.0312235876. The cubic root of 140423240 is about 519.7721388258.

Adding to 140423240 its reverse (42324041), we get a palindrome (182747281).

The spelling of 140423240 in words is "one hundred forty million, four hundred twenty-three thousand, two hundred forty".