3655899021 has 8 divisors (see below), whose sum is σ = 4883285664. Its totient is φ = 2432889200.

The previous prime is 3655898989. The next prime is 3655899047. The reversal of 3655899021 is 1209985563.

It is a happy number.

3655899021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3655899021 - 2⁵ = 3655898989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655899061) 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, 1092255 + ... + 1095596.

It is an arithmetic number, because the mean of its divisors is an integer number (610410708).

Almost surely, 2^3655899021 is an apocalyptic number.

It is an amenable number.

3655899021 is a deficient number, since it is larger than the sum of its proper divisors (1227386643).

3655899021 is a wasteful number, since it uses less digits than its factorization.

3655899021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188411.

The product of its (nonzero) digits is 583200, while the sum is 48.

The square root of 3655899021 is about 60464.0308034454. The cubic root of 3655899021 is about 1540.5107403881.

The spelling of 3655899021 in words is "three billion, six hundred fifty-five million, eight hundred ninety-nine thousand, twenty-one".