1646020427 has 4 divisors (see below), whose sum is σ = 1742845176. Its totient is φ = 1549195680.

The previous prime is 1646020373. The next prime is 1646020447. The reversal of 1646020427 is 7240206461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1646020427 - 2⁸ = 1646020171 is a prime.

It is a super-2 number, since 2×1646020427² = 5418766492202524658, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1646020393 and 1646020402.

It is not an unprimeable number, because it can be changed into a prime (1646020447) 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, 48412349 + ... + 48412382.

It is an arithmetic number, because the mean of its divisors is an integer number (435711294).

Almost surely, 2^1646020427 is an apocalyptic number.

1646020427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1646020427 is a deficient number, since it is larger than the sum of its proper divisors (96824749).

1646020427 is an equidigital number, since it uses as much as digits as its factorization.

1646020427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96824748.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1646020427 is about 40571.1772937390. The cubic root of 1646020427 is about 1180.7149806081.

Adding to 1646020427 its reverse (7240206461), we get a palindrome (8886226888).

The spelling of 1646020427 in words is "one billion, six hundred forty-six million, twenty thousand, four hundred twenty-seven".