140398409 has 2 divisors, whose sum is σ = 140398410. Its totient is φ = 140398408.

The previous prime is 140398381. The next prime is 140398421. The reversal of 140398409 is 904893041.

140398409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83320384 + 57078025 = 9128^2 + 7555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140398409 is a prime.

It is not a weakly prime, because it can be changed into another prime (140398459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70199204 + 70199205.

It is an arithmetic number, because the mean of its divisors is an integer number (70199205).

Almost surely, 2^140398409 is an apocalyptic number.

It is an amenable number.

140398409 is a deficient number, since it is larger than the sum of its proper divisors (1).

140398409 is an equidigital number, since it uses as much as digits as its factorization.

140398409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 140398409 is about 11848.9834585082. The cubic root of 140398409 is about 519.7414999686.

The spelling of 140398409 in words is "one hundred forty million, three hundred ninety-eight thousand, four hundred nine".