349988257 has 4 divisors (see below), whose sum is σ = 351516820. Its totient is φ = 348459696.

The previous prime is 349988213. The next prime is 349988279. The reversal of 349988257 is 752889943.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 259338816 + 90649441 = 16104^2 + 9521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-349988257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 349988198 and 349988207.

It is not an unprimeable number, because it can be changed into a prime (349988057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763938 + ... + 764395.

It is an arithmetic number, because the mean of its divisors is an integer number (87879205).

Almost surely, 2^349988257 is an apocalyptic number.

It is an amenable number.

349988257 is a deficient number, since it is larger than the sum of its proper divisors (1528563).

349988257 is a wasteful number, since it uses less digits than its factorization.

349988257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528562.

The product of its digits is 4354560, while the sum is 55.

The square root of 349988257 is about 18707.9730863608. The cubic root of 349988257 is about 704.7219915537.

The spelling of 349988257 in words is "three hundred forty-nine million, nine hundred eighty-eight thousand, two hundred fifty-seven".