3975721087 has 8 divisors (see below), whose sum is σ = 4385974320. Its totient is φ = 3580386240.

The previous prime is 3975721081. The next prime is 3975721103. The reversal of 3975721087 is 7801275793.

It is a happy number.

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 3975721087 - 2¹⁵ = 3975688319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3975721087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3975721081) 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, 3729037 + ... + 3730102.

It is an arithmetic number, because the mean of its divisors is an integer number (548246790).

Almost surely, 2^3975721087 is an apocalyptic number.

3975721087 is a deficient number, since it is larger than the sum of its proper divisors (410253233).

3975721087 is a wasteful number, since it uses less digits than its factorization.

3975721087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7459193.

The product of its (nonzero) digits is 740880, while the sum is 49.

The square root of 3975721087 is about 63053.3193971578. The cubic root of 3975721087 is about 1584.1828342535.

The spelling of 3975721087 in words is "three billion, nine hundred seventy-five million, seven hundred twenty-one thousand, eighty-seven".