390119021 has 2 divisors, whose sum is σ = 390119022. Its totient is φ = 390119020.

The previous prime is 390119017. The next prime is 390119029. The reversal of 390119021 is 120911093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278055625 + 112063396 = 16675^2 + 10586^2 .

It is a cyclic number.

It is not a de Polignac number, because 390119021 - 2² = 390119017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390119029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195059510 + 195059511.

It is an arithmetic number, because the mean of its divisors is an integer number (195059511).

Almost surely, 2^390119021 is an apocalyptic number.

It is an amenable number.

390119021 is a deficient number, since it is larger than the sum of its proper divisors (1).

390119021 is an equidigital number, since it uses as much as digits as its factorization.

390119021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 390119021 is about 19751.4308595605. The cubic root of 390119021 is about 730.6886733096.

It can be divided in two parts, 3901 and 19021, that added together give a palindrome (22922).

The spelling of 390119021 in words is "three hundred ninety million, one hundred nineteen thousand, twenty-one".