3691797840 has 120 divisors (see below), whose sum is σ = 12733468488. Its totient is φ = 957864960.

The previous prime is 3691797821. The next prime is 3691797841. The reversal of 3691797840 is 487971963.

It is a happy number.

3691797840 is a `hidden beast` number, since 369 + 179 + 78 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2016369216 + 1675428624 = 44904^2 + 40932^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691797841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42651 + ... + 95930.

Almost surely, 2^3691797840 is an apocalyptic number.

3691797840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3691797840 is an abundant number, since it is smaller than the sum of its proper divisors (9041670648).

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

3691797840 is a wasteful number, since it uses less digits than its factorization.

3691797840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138637 (or 138628 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 3691797840 is about 60760.1665567171. The cubic root of 3691797840 is about 1545.5366345240.

The spelling of 3691797840 in words is "three billion, six hundred ninety-one million, seven hundred ninety-seven thousand, eight hundred forty".