1605123930 has 16 divisors (see below), whose sum is σ = 3852297504. Its totient is φ = 428033040.

The previous prime is 1605123913. The next prime is 1605123943. The reversal of 1605123930 is 393215061.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 53504131 = 1605123930 / (1 + 6 + 0 + 5 + 1 + 2 + 3 + 9 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26752036 + ... + 26752095.

It is an arithmetic number, because the mean of its divisors is an integer number (240768594).

Almost surely, 2^1605123930 is an apocalyptic number.

1605123930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1605123930 is an abundant number, since it is smaller than the sum of its proper divisors (2247173574).

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

1605123930 is a wasteful number, since it uses less digits than its factorization.

1605123930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53504141.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 1605123930 is about 40063.9979283146. The cubic root of 1605123930 is about 1170.8543033721.

Adding to 1605123930 its reverse (393215061), we get a palindrome (1998338991).

The spelling of 1605123930 in words is "one billion, six hundred five million, one hundred twenty-three thousand, nine hundred thirty".