122047640 has 128 divisors (see below), whose sum is σ = 339897600. Its totient is φ = 38776320.

The previous prime is 122047633. The next prime is 122047643. The reversal of 122047640 is 46740221.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122047643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108119 + ... + 109241.

It is an arithmetic number, because the mean of its divisors is an integer number (2655450).

Almost surely, 2^122047640 is an apocalyptic number.

122047640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122047640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169948800).

122047640 is an abundant number, since it is smaller than the sum of its proper divisors (217849960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

122047640 is a wasteful number, since it uses less digits than its factorization.

122047640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 122047640 is about 11047.5173681692. The cubic root of 122047640 is about 496.0321150728.

Adding to 122047640 its reverse (46740221), we get a palindrome (168787861).

The spelling of 122047640 in words is "one hundred twenty-two million, forty-seven thousand, six hundred forty".