421738 has 4 divisors (see below), whose sum is σ = 632610. Its totient is φ = 210868.

The previous prime is 421727. The next prime is 421739. The reversal of 421738 is 837124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 267289 + 154449 = 517^2 + 393^2 .

It is not an unprimeable number, because it can be changed into a prime (421739) by changing a digit.

421738 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105433 + ... + 105436.

2⁴²¹⁷³⁸ is an apocalyptic number.

421738 is a deficient number, since it is larger than the sum of its proper divisors (210872).

421738 is a wasteful number, since it uses less digits than its factorization.

421738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210871.

The product of its digits is 1344, while the sum is 25.

The square root of 421738 is about 649.4135816258. The cubic root of 421738 is about 74.9918806025.

The spelling of 421738 in words is "four hundred twenty-one thousand, seven hundred thirty-eight".