1613897840 has 20 divisors (see below), whose sum is σ = 3752312664. Its totient is φ = 645559104.

The previous prime is 1613897837. The next prime is 1613897849. The reversal of 1613897840 is 487983161.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613897849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10086782 + ... + 10086941.

Almost surely, 2^1613897840 is an apocalyptic number.

1613897840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1613897840 is an abundant number, since it is smaller than the sum of its proper divisors (2138414824).

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

1613897840 is a wasteful number, since it uses less digits than its factorization.

1613897840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20173736 (or 20173730 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 1613897840 is about 40173.3473835577. The cubic root of 1613897840 is about 1172.9837981166.

The spelling of 1613897840 in words is "one billion, six hundred thirteen million, eight hundred ninety-seven thousand, eight hundred forty".