1642638 has 8 divisors (see below), whose sum is σ = 3285288. Its totient is φ = 547544.

The previous prime is 1642633. The next prime is 1642649. The reversal of 1642638 is 8362461.

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

1642638 is an admirable number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642631) 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, 136881 + ... + 136892.

It is an arithmetic number, because the mean of its divisors is an integer number (410661).

2^1642638 is an apocalyptic number.

1642638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1642638 is a wasteful number, since it uses less digits than its factorization.

1642638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273778.

The product of its digits is 6912, while the sum is 30.

The square root of 1642638 is about 1281.6543995945. The cubic root of 1642638 is about 117.9905670904.

The spelling of 1642638 in words is "one million, six hundred forty-two thousand, six hundred thirty-eight".