140340421 has 4 divisors (see below), whose sum is σ = 151135852. Its totient is φ = 129544992.

The previous prime is 140340407. The next prime is 140340427. The reversal of 140340421 is 124043041.

140340421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15124321 + 125216100 = 3889^2 + 11190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140340421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140340427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5397696 + ... + 5397721.

It is an arithmetic number, because the mean of its divisors is an integer number (37783963).

Almost surely, 2^140340421 is an apocalyptic number.

It is an amenable number.

140340421 is a deficient number, since it is larger than the sum of its proper divisors (10795431).

140340421 is a wasteful number, since it uses less digits than its factorization.

140340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10795430.

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

The square root of 140340421 is about 11846.5362448270. The cubic root of 140340421 is about 519.6699347692.

Adding to 140340421 its reverse (124043041), we get a palindrome (264383462).

The spelling of 140340421 in words is "one hundred forty million, three hundred forty thousand, four hundred twenty-one".