1646238638 has 24 divisors (see below), whose sum is σ = 2772022176. Its totient is φ = 732364160.

The previous prime is 1646238631. The next prime is 1646238647. The reversal of 1646238638 is 8368326461.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a junction number, because it is equal to n+sod(n) for n = 1646238592 and 1646238601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646238631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60995 + ... + 83742.

It is an arithmetic number, because the mean of its divisors is an integer number (115500924).

Almost surely, 2^1646238638 is an apocalyptic number.

1646238638 is a deficient number, since it is larger than the sum of its proper divisors (1125783538).

1646238638 is a wasteful number, since it uses less digits than its factorization.

1646238638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144808 (or 144797 counting only the distinct ones).

The product of its digits is 995328, while the sum is 47.

The square root of 1646238638 is about 40573.8664413437. The cubic root of 1646238638 is about 1180.7671536367.

The spelling of 1646238638 in words is "one billion, six hundred forty-six million, two hundred thirty-eight thousand, six hundred thirty-eight".