400119509 has 2 divisors, whose sum is σ = 400119510. Its totient is φ = 400119508.

The previous prime is 400119493. The next prime is 400119541. The reversal of 400119509 is 905911004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397803025 + 2316484 = 19945^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 400119509 - 2⁴ = 400119493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400119589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200059754 + 200059755.

It is an arithmetic number, because the mean of its divisors is an integer number (200059755).

Almost surely, 2^400119509 is an apocalyptic number.

It is an amenable number.

400119509 is a deficient number, since it is larger than the sum of its proper divisors (1).

400119509 is an equidigital number, since it uses as much as digits as its factorization.

400119509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 400119509 is about 20002.9875018708. The cubic root of 400119509 is about 736.8796715748.

The spelling of 400119509 in words is "four hundred million, one hundred nineteen thousand, five hundred nine".