1605404240 has 80 divisors (see below), whose sum is σ = 4286243520. Its totient is φ = 553052160.

The previous prime is 1605404237. The next prime is 1605404303. The reversal of 1605404240 is 424045061.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31289 + ... + 64728.

It is an arithmetic number, because the mean of its divisors is an integer number (53578044).

Almost surely, 2^1605404240 is an apocalyptic number.

1605404240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605404240 is an abundant number, since it is smaller than the sum of its proper divisors (2680839280).

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

1605404240 is a wasteful number, since it uses less digits than its factorization.

1605404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96060 (or 96054 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1605404240 is about 40067.4960535345. The cubic root of 1605404240 is about 1170.9224565866.

The spelling of 1605404240 in words is "one billion, six hundred five million, four hundred four thousand, two hundred forty".