1630431 has 24 divisors (see below), whose sum is σ = 2635776. Its totient is φ = 962640.

The previous prime is 1630429. The next prime is 1630441. The reversal of 1630431 is 1340361.

1630431 is a `hidden beast` number, since 1 + 630 + 4 + 31 = 666.

It is not a de Polignac number, because 1630431 - 2¹ = 1630429 is a prime.

It is a super-2 number, since 2×1630431² = 5316610491522, which contains 22 as substring.

1630431 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1630411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4066 + ... + 4448.

It is an arithmetic number, because the mean of its divisors is an integer number (109824).

2^1630431 is an apocalyptic number.

1630431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1630431 is a deficient number, since it is larger than the sum of its proper divisors (1005345).

1630431 is a wasteful number, since it uses less digits than its factorization.

1630431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1630431 is about 1276.8833149509. The cubic root of 1630431 is about 117.6975641142.

Adding to 1630431 its reverse (1340361), we get a palindrome (2970792).

The spelling of 1630431 in words is "one million, six hundred thirty thousand, four hundred thirty-one".