140478409 has 2 divisors, whose sum is σ = 140478410. Its totient is φ = 140478408.

The previous prime is 140478397. The next prime is 140478451. The reversal of 140478409 is 904874041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131905225 + 8573184 = 11485^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 140478409 - 2¹¹ = 140476361 is a prime.

It is equal to p_7937650 and since 140478409 and 7937650 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (140478479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70239204 + 70239205.

It is an arithmetic number, because the mean of its divisors is an integer number (70239205).

Almost surely, 2^140478409 is an apocalyptic number.

It is an amenable number.

140478409 is a deficient number, since it is larger than the sum of its proper divisors (1).

140478409 is an equidigital number, since it uses as much as digits as its factorization.

140478409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 140478409 is about 11852.3587947716. The cubic root of 140478409 is about 519.8401986775.

The spelling of 140478409 in words is "one hundred forty million, four hundred seventy-eight thousand, four hundred nine".