421620738 has 64 divisors (see below), whose sum is σ = 1073737728. Its totient is φ = 107176320.

The previous prime is 421620733. The next prime is 421620769. The reversal of 421620738 is 837026124.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 421620699 and 421620708.

It is not an unprimeable number, because it can be changed into a prime (421620733) 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, 12006 + ... + 31422.

It is an arithmetic number, because the mean of its divisors is an integer number (16777152).

Almost surely, 2^421620738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421620738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536868864).

421620738 is an abundant number, since it is smaller than the sum of its proper divisors (652116990).

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

421620738 is a wasteful number, since it uses less digits than its factorization.

421620738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19487.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 421620738 is about 20533.4054165401. The cubic root of 421620738 is about 749.8492959420.

The spelling of 421620738 in words is "four hundred twenty-one million, six hundred twenty thousand, seven hundred thirty-eight".