349778629 has 2 divisors, whose sum is σ = 349778630. Its totient is φ = 349778628.

The previous prime is 349778617. The next prime is 349778669. The reversal of 349778629 is 926877943.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346034404 + 3744225 = 18602^2 + 1935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349778629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 349778629.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349778669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174889314 + 174889315.

It is an arithmetic number, because the mean of its divisors is an integer number (174889315).

Almost surely, 2^349778629 is an apocalyptic number.

It is an amenable number.

349778629 is a deficient number, since it is larger than the sum of its proper divisors (1).

349778629 is an equidigital number, since it uses as much as digits as its factorization.

349778629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 55.

The square root of 349778629 is about 18702.3696092233. The cubic root of 349778629 is about 704.5812640073.

The spelling of 349778629 in words is "three hundred forty-nine million, seven hundred seventy-eight thousand, six hundred twenty-nine".