421650018 has 24 divisors (see below), whose sum is σ = 925142400. Its totient is φ = 138770424.

The previous prime is 421650013. The next prime is 421650023. The reversal of 421650018 is 810056124.

421650018 is a `hidden beast` number, since 4 + 2 + 1 + 650 + 0 + 1 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (421650013) and next prime (421650023).

It is a junction number, because it is equal to n+sod(n) for n = 421649973 and 421650000.

It is not an unprimeable number, because it can be changed into a prime (421650013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146838 + ... + 149681.

It is an arithmetic number, because the mean of its divisors is an integer number (38547600).

Almost surely, 2^421650018 is an apocalyptic number.

421650018 is an abundant number, since it is smaller than the sum of its proper divisors (503492382).

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

421650018 is a wasteful number, since it uses less digits than its factorization.

421650018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296606 (or 296603 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 421650018 is about 20534.1183886721. The cubic root of 421650018 is about 749.8666536264.

The spelling of 421650018 in words is "four hundred twenty-one million, six hundred fifty thousand, eighteen".