1609438940 has 24 divisors (see below), whose sum is σ = 3381324912. Its totient is φ = 643489280.

The previous prime is 1609438937. The next prime is 1609438951. The reversal of 1609438940 is 498349061.

It is a junction number, because it is equal to n+sod(n) for n = 1609438891 and 1609438900.

It is a congruent number.

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, 31532 + ... + 64908.

It is an arithmetic number, because the mean of its divisors is an integer number (140888538).

Almost surely, 2^1609438940 is an apocalyptic number.

1609438940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1609438940 is an abundant number, since it is smaller than the sum of its proper divisors (1771885972).

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

1609438940 is a wasteful number, since it uses less digits than its factorization.

1609438940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35797 (or 35795 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1609438940 is about 40117.8132504752. The cubic root of 1609438940 is about 1171.9025562848.

The spelling of 1609438940 in words is "one billion, six hundred nine million, four hundred thirty-eight thousand, nine hundred forty".