349778757 has 8 divisors (see below), whose sum is σ = 493805376. Its totient is φ = 219468992.

The previous prime is 349778753. The next prime is 349778789. The reversal of 349778757 is 757877943.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 349778757 - 2² = 349778753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 349778697 and 349778706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349778753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3429153 + ... + 3429254.

It is an arithmetic number, because the mean of its divisors is an integer number (61725672).

Almost surely, 2^349778757 is an apocalyptic number.

It is an amenable number.

349778757 is a deficient number, since it is larger than the sum of its proper divisors (144026619).

349778757 is a wasteful number, since it uses less digits than its factorization.

349778757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6858427.

The product of its digits is 10372320, while the sum is 57.

The square root of 349778757 is about 18702.3730312493. The cubic root of 349778757 is about 704.5813499535.

It can be divided in two parts, 34977 and 8757, that added together give a palindrome (43734).

The spelling of 349778757 in words is "three hundred forty-nine million, seven hundred seventy-eight thousand, seven hundred fifty-seven".