421642 has 8 divisors (see below), whose sum is σ = 681156. Its totient is φ = 194592.

The previous prime is 421639. The next prime is 421643. The reversal of 421642 is 246124.

It can be written as a sum of positive squares in 2 ways, for example, as 421201 + 441 = 649^2 + 21^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (421643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8083 + ... + 8134.

2⁴²¹⁶⁴² is an apocalyptic number.

421642 is a deficient number, since it is larger than the sum of its proper divisors (259514).

421642 is a wasteful number, since it uses less digits than its factorization.

421642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16232.

The product of its digits is 384, while the sum is 19.

The square root of 421642 is about 649.3396645824. The cubic root of 421642 is about 74.9861900499.

Adding to 421642 its reverse (246124), we get a palindrome (667766).

It can be divided in two parts, 4 and 21642, that multiplied together give a palindrome (86568).

The spelling of 421642 in words is "four hundred twenty-one thousand, six hundred forty-two".