345020399 has 2 divisors, whose sum is σ = 345020400. Its totient is φ = 345020398.

The previous prime is 345020383. The next prime is 345020419. The reversal of 345020399 is 993020543.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 345020399 - 2⁴ = 345020383 is a prime.

It is a super-2 number, since 2×345020399² = 238078151452238402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345020339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172510199 + 172510200.

It is an arithmetic number, because the mean of its divisors is an integer number (172510200).

Almost surely, 2^345020399 is an apocalyptic number.

345020399 is a deficient number, since it is larger than the sum of its proper divisors (1).

345020399 is an equidigital number, since it uses as much as digits as its factorization.

345020399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 345020399 is about 18574.7247355109. The cubic root of 345020399 is about 701.3717312659.

The spelling of 345020399 in words is "three hundred forty-five million, twenty thousand, three hundred ninety-nine".