3984020651 has 4 divisors (see below), whose sum is σ = 4290483792. Its totient is φ = 3677557512.

The previous prime is 3984020597. The next prime is 3984020671. The reversal of 3984020651 is 1560204893.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3984020651 - 2²⁶ = 3916911787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3984020671) 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, 153231551 + ... + 153231576.

It is an arithmetic number, because the mean of its divisors is an integer number (1072620948).

Almost surely, 2^3984020651 is an apocalyptic number.

3984020651 is a deficient number, since it is larger than the sum of its proper divisors (306463141).

3984020651 is a wasteful number, since it uses less digits than its factorization.

3984020651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306463140.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 3984020651 is about 63119.0989400197. The cubic root of 3984020651 is about 1585.2844279873.

The spelling of 3984020651 in words is "three billion, nine hundred eighty-four million, twenty thousand, six hundred fifty-one".