122639257 has 8 divisors (see below), whose sum is σ = 132553736. Its totient is φ = 112793472.

The previous prime is 122639233. The next prime is 122639263. The reversal of 122639257 is 752936221.

It can be written as a sum of positive squares in 4 ways, for example, as 5588496 + 117050761 = 2364^2 + 10819^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122639257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122639287) 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, 13428 + ... + 20629.

It is an arithmetic number, because the mean of its divisors is an integer number (16569217).

Almost surely, 2^122639257 is an apocalyptic number.

It is an amenable number.

122639257 is a deficient number, since it is larger than the sum of its proper divisors (9914479).

122639257 is a wasteful number, since it uses less digits than its factorization.

122639257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34347.

The product of its digits is 45360, while the sum is 37.

The square root of 122639257 is about 11074.2610137201. The cubic root of 122639257 is about 496.8323166109.

The spelling of 122639257 in words is "one hundred twenty-two million, six hundred thirty-nine thousand, two hundred fifty-seven".