1620138007 has 2 divisors, whose sum is σ = 1620138008. Its totient is φ = 1620138006.

The previous prime is 1620137993. The next prime is 1620138043. The reversal of 1620138007 is 7008310261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620138007 - 2⁷ = 1620137879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620138077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810069003 + 810069004.

It is an arithmetic number, because the mean of its divisors is an integer number (810069004).

Almost surely, 2^1620138007 is an apocalyptic number.

1620138007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620138007 is an equidigital number, since it uses as much as digits as its factorization.

1620138007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1620138007 is about 40250.9379642264. The cubic root of 1620138007 is about 1174.4936419678.

Adding to 1620138007 its reverse (7008310261), we get a palindrome (8628448268).

The spelling of 1620138007 in words is "one billion, six hundred twenty million, one hundred thirty-eight thousand, seven".