1605812940 has 72 divisors (see below), whose sum is σ = 5038946640. Its totient is φ = 413449344.

The previous prime is 1605812899. The next prime is 1605813007. The reversal of 1605812940 is 492185061.

1605812940 is a `hidden beast` number, since 1 + 605 + 8 + 1 + 2 + 9 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1605812895 and 1605812904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148594 + ... + 159033.

It is an arithmetic number, because the mean of its divisors is an integer number (69985370).

Almost surely, 2^1605812940 is an apocalyptic number.

1605812940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605812940 is an abundant number, since it is smaller than the sum of its proper divisors (3433133700).

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

1605812940 is a wasteful number, since it uses less digits than its factorization.

1605812940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307671 (or 307666 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1605812940 is about 40072.5958729903. The cubic root of 1605812940 is about 1171.0218117089.

The spelling of 1605812940 in words is "one billion, six hundred five million, eight hundred twelve thousand, nine hundred forty".