140406121 has 4 divisors (see below), whose sum is σ = 142383744. Its totient is φ = 138428500.

The previous prime is 140406113. The next prime is 140406131. The reversal of 140406121 is 121604041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 140406121 - 2³ = 140406113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140406131) 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, 988705 + ... + 988846.

It is an arithmetic number, because the mean of its divisors is an integer number (35595936).

Almost surely, 2^140406121 is an apocalyptic number.

It is an amenable number.

140406121 is a deficient number, since it is larger than the sum of its proper divisors (1977623).

140406121 is an equidigital number, since it uses as much as digits as its factorization.

140406121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977622.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 140406121 is about 11849.3088827999. The cubic root of 140406121 is about 519.7510161568.

The spelling of 140406121 in words is "one hundred forty million, four hundred six thousand, one hundred twenty-one".