140043421 has 6 divisors (see below), whose sum is σ = 162907710. Its totient is φ = 120037176.

The previous prime is 140043401. The next prime is 140043427. The reversal of 140043421 is 124340041.

It can be written as a sum of positive squares in only one way, i.e., 120780100 + 19263321 = 10990^2 + 4389^2 .

It is not a de Polignac number, because 140043421 - 2⁹ = 140042909 is a prime.

It is a super-2 number, since 2×140043421² = 39224319530766482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140043427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1428966 + ... + 1429063.

It is an arithmetic number, because the mean of its divisors is an integer number (27151285).

Almost surely, 2^140043421 is an apocalyptic number.

It is an amenable number.

140043421 is a deficient number, since it is larger than the sum of its proper divisors (22864289).

140043421 is an equidigital number, since it uses as much as digits as its factorization.

140043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858043 (or 2858036 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 140043421 is about 11833.9942960946. The cubic root of 140043421 is about 519.3030863711.

Adding to 140043421 its reverse (124340041), we get a palindrome (264383462).

The spelling of 140043421 in words is "one hundred forty million, forty-three thousand, four hundred twenty-one".