3970021557 has 16 divisors (see below), whose sum is σ = 5593167360. Its totient is φ = 2497838832.

The previous prime is 3970021499. The next prime is 3970021607. The reversal of 3970021557 is 7551200793.

It is not a de Polignac number, because 3970021557 - 2¹¹ = 3970019509 is a prime.

It is a super-2 number, since 2×3970021557² = 31522142326089408498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3970021157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117423 + ... + 147404.

It is an arithmetic number, because the mean of its divisors is an integer number (349572960).

Almost surely, 2^3970021557 is an apocalyptic number.

It is an amenable number.

3970021557 is a deficient number, since it is larger than the sum of its proper divisors (1623145803).

3970021557 is a wasteful number, since it uses less digits than its factorization.

3970021557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265112.

The product of its (nonzero) digits is 66150, while the sum is 39.

The square root of 3970021557 is about 63008.1070736139. The cubic root of 3970021557 is about 1583.4254525117.

The spelling of 3970021557 in words is "three billion, nine hundred seventy million, twenty-one thousand, five hundred fifty-seven".