1630421 has 8 divisors (see below), whose sum is σ = 1768704. Its totient is φ = 1494000.

The previous prime is 1630411. The next prime is 1630423. The reversal of 1630421 is 1240361.

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

It is a cyclic number.

It is not a de Polignac number, because 1630421 - 2⁶ = 1630357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1630421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1796 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (221088).

2^1630421 is an apocalyptic number.

It is an amenable number.

1630421 is a deficient number, since it is larger than the sum of its proper divisors (138283).

1630421 is a wasteful number, since it uses less digits than its factorization.

1630421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1630421 is about 1276.8793991603. The cubic root of 1630421 is about 117.6973234871.

Adding to 1630421 its reverse (1240361), we get a palindrome (2870782).

The spelling of 1630421 in words is "one million, six hundred thirty thousand, four hundred twenty-one".