349777789 has 4 divisors (see below), whose sum is σ = 349818624. Its totient is φ = 349736956.

The previous prime is 349777777. The next prime is 349777811. The reversal of 349777789 is 987777943.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 987777943 = 3119 ⋅316697.

It is a cyclic number.

It is not a de Polignac number, because 349777789 - 2⁷ = 349777661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349777709) 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, 2077 + ... + 26530.

It is an arithmetic number, because the mean of its divisors is an integer number (87454656).

Almost surely, 2^349777789 is an apocalyptic number.

It is an amenable number.

349777789 is a deficient number, since it is larger than the sum of its proper divisors (40835).

349777789 is a wasteful number, since it uses less digits than its factorization.

349777789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40834.

The product of its digits is 18670176, while the sum is 61.

The square root of 349777789 is about 18702.3471521625. The cubic root of 349777789 is about 704.5806999851.

The spelling of 349777789 in words is "three hundred forty-nine million, seven hundred seventy-seven thousand, seven hundred eighty-nine".