346640155 has 4 divisors (see below), whose sum is σ = 415968192. Its totient is φ = 277312120.

The previous prime is 346640131. The next prime is 346640167. The reversal of 346640155 is 551046643.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551046643 = 7 ⋅78720949.

It is not a de Polignac number, because 346640155 - 2⁷ = 346640027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 346640155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34664011 + ... + 34664020.

It is an arithmetic number, because the mean of its divisors is an integer number (103992048).

Almost surely, 2^346640155 is an apocalyptic number.

346640155 is a deficient number, since it is larger than the sum of its proper divisors (69328037).

346640155 is an equidigital number, since it uses as much as digits as its factorization.

346640155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69328036.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 346640155 is about 18618.2747589566. The cubic root of 346640155 is about 702.4675871453.

Adding to 346640155 its reverse (551046643), we get a palindrome (897686798).

The spelling of 346640155 in words is "three hundred forty-six million, six hundred forty thousand, one hundred fifty-five".