390234109 has 2 divisors, whose sum is σ = 390234110. Its totient is φ = 390234108.

The previous prime is 390234059. The next prime is 390234113. The reversal of 390234109 is 901432093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245705625 + 144528484 = 15675^2 + 12022^2 .

It is a cyclic number.

It is not a de Polignac number, because 390234109 - 2¹³ = 390225917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390234139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195117054 + 195117055.

It is an arithmetic number, because the mean of its divisors is an integer number (195117055).

Almost surely, 2^390234109 is an apocalyptic number.

It is an amenable number.

390234109 is a deficient number, since it is larger than the sum of its proper divisors (1).

390234109 is an equidigital number, since it uses as much as digits as its factorization.

390234109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 390234109 is about 19754.3440539037. The cubic root of 390234109 is about 730.7605191015.

The spelling of 390234109 in words is "three hundred ninety million, two hundred thirty-four thousand, one hundred nine".