122478642 has 160 divisors (see below), whose sum is σ = 342486144. Its totient is φ = 32140800.

The previous prime is 122478623. The next prime is 122478647. The reversal of 122478642 is 246874221.

122478642 is a `hidden beast` number, since 1 + 2 + 2 + 4 + 7 + 8 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 122478597 and 122478606.

It is not an unprimeable number, because it can be changed into a prime (122478647) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 393667 + ... + 393977.

Almost surely, 2^122478642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122478642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171243072).

122478642 is an abundant number, since it is smaller than the sum of its proper divisors (220007502).

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

122478642 is a wasteful number, since it uses less digits than its factorization.

122478642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 357 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 122478642 is about 11067.0069124402. The cubic root of 122478642 is about 496.6153290380.

The spelling of 122478642 in words is "one hundred twenty-two million, four hundred seventy-eight thousand, six hundred forty-two".