1631642 has 4 divisors (see below), whose sum is σ = 2447466. Its totient is φ = 815820.

The previous prime is 1631639. The next prime is 1631647. The reversal of 1631642 is 2461361.

It is a happy number.

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., 1515361 + 116281 = 1231^2 + 341^2 .

It is not an unprimeable number, because it can be changed into a prime (1631647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407909 + ... + 407912.

2^1631642 is an apocalyptic number.

1631642 is a deficient number, since it is larger than the sum of its proper divisors (815824).

1631642 is an equidigital number, since it uses as much as digits as its factorization.

1631642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815823.

The product of its digits is 864, while the sum is 23.

The square root of 1631642 is about 1277.3574284436. The cubic root of 1631642 is about 117.7266967948.

The spelling of 1631642 in words is "one million, six hundred thirty-one thousand, six hundred forty-two".