1605104440 has 32 divisors (see below), whose sum is σ = 3672702000. Its totient is φ = 631158784.

The previous prime is 1605104429. The next prime is 1605104443. The reversal of 1605104440 is 444015061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605104443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337705 + ... + 342424.

Almost surely, 2^1605104440 is an apocalyptic number.

1605104440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605104440 is an abundant number, since it is smaller than the sum of its proper divisors (2067597560).

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

1605104440 is a wasteful number, since it uses less digits than its factorization.

1605104440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680199 (or 680195 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1605104440 is about 40063.7546917410. The cubic root of 1605104440 is about 1170.8495643730.

The spelling of 1605104440 in words is "one billion, six hundred five million, one hundred four thousand, four hundred forty".