122784257 has 4 divisors (see below), whose sum is σ = 125396736. Its totient is φ = 120171780.

The previous prime is 122784253. The next prime is 122784269. The reversal of 122784257 is 752487221.

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 an emirpimes, since its reverse is a distinct semiprime: 752487221 = 563 ⋅1336567.

It is a cyclic number.

It is not a de Polignac number, because 122784257 - 2² = 122784253 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 122784257.

It is not an unprimeable number, because it can be changed into a prime (122784253) 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, 1306169 + ... + 1306262.

It is an arithmetic number, because the mean of its divisors is an integer number (31349184).

Almost surely, 2^122784257 is an apocalyptic number.

It is an amenable number.

122784257 is a deficient number, since it is larger than the sum of its proper divisors (2612479).

122784257 is an equidigital number, since it uses as much as digits as its factorization.

122784257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612478.

The product of its digits is 62720, while the sum is 38.

The square root of 122784257 is about 11080.8057919991. The cubic root of 122784257 is about 497.0280459783.

The spelling of 122784257 in words is "one hundred twenty-two million, seven hundred eighty-four thousand, two hundred fifty-seven".