140121409 has 4 divisors (see below), whose sum is σ = 147496240. Its totient is φ = 132746580.

The previous prime is 140121407. The next prime is 140121427. The reversal of 140121409 is 904121041.

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, and also an emirpimes, since its reverse is a distinct semiprime: 904121041 = 373 ⋅2423917.

It is a cyclic number.

It is not a de Polignac number, because 140121409 - 2¹ = 140121407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 140121409.

It is not an unprimeable number, because it can be changed into a prime (140121407) 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, 3687387 + ... + 3687424.

It is an arithmetic number, because the mean of its divisors is an integer number (36874060).

Almost surely, 2^140121409 is an apocalyptic number.

140121409 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

140121409 is a deficient number, since it is larger than the sum of its proper divisors (7374831).

140121409 is an equidigital number, since it uses as much as digits as its factorization.

140121409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7374830.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 140121409 is about 11837.2889210326. The cubic root of 140121409 is about 519.3994657495.

The spelling of 140121409 in words is "one hundred forty million, one hundred twenty-one thousand, four hundred nine".