390141509 has 2 divisors, whose sum is σ = 390141510. Its totient is φ = 390141508.

The previous prime is 390141467. The next prime is 390141523. The reversal of 390141509 is 905141093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221920609 + 168220900 = 14897^2 + 12970^2 .

It is a cyclic number.

It is not a de Polignac number, because 390141509 - 2¹² = 390137413 is a prime.

It is a Chen prime.

It is equal to p_20838290 and since 390141509 and 20838290 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390141529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195070754 + 195070755.

It is an arithmetic number, because the mean of its divisors is an integer number (195070755).

Almost surely, 2^390141509 is an apocalyptic number.

It is an amenable number.

390141509 is a deficient number, since it is larger than the sum of its proper divisors (1).

390141509 is an equidigital number, since it uses as much as digits as its factorization.

390141509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 390141509 is about 19752.0001265695. Note that the first 3 decimals coincide. The cubic root of 390141509 is about 730.7027129661.

The spelling of 390141509 in words is "three hundred ninety million, one hundred forty-one thousand, five hundred nine".