122186440 has 32 divisors (see below), whose sum is σ = 276524280. Its totient is φ = 48589312.

The previous prime is 122186413. The next prime is 122186443. The reversal of 122186440 is 44681221.

It can be written as a sum of positive squares in 4 ways, for example, as 100040004 + 22146436 = 10002^2 + 4706^2 .

It is a super-2 number, since 2×122186440² = 29859052239747200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 122186399 and 122186408.

It is not an unprimeable number, because it can be changed into a prime (122186443) 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, 1909 + ... + 15748.

Almost surely, 2^122186440 is an apocalyptic number.

122186440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122186440 is an abundant number, since it is smaller than the sum of its proper divisors (154337840).

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

122186440 is a wasteful number, since it uses less digits than its factorization.

122186440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17841 (or 17837 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 122186440 is about 11053.7975374981. The cubic root of 122186440 is about 496.2200831324.

The spelling of 122186440 in words is "one hundred twenty-two million, one hundred eighty-six thousand, four hundred forty".