3957743421 has 6 divisors (see below), whose sum is σ = 5716740510. Its totient is φ = 2638495608.

The previous prime is 3957743417. The next prime is 3957743437. The reversal of 3957743421 is 1243477593.

3957743421 is a `hidden beast` number, since 39 + 577 + 4 + 3 + 42 + 1 = 666.

3957743421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2807516196 + 1150227225 = 52986^2 + 33915^2 .

It is not a de Polignac number, because 3957743421 - 2² = 3957743417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3957743821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219874626 + ... + 219874643.

It is an arithmetic number, because the mean of its divisors is an integer number (952790085).

Almost surely, 2^3957743421 is an apocalyptic number.

It is an amenable number.

3957743421 is a deficient number, since it is larger than the sum of its proper divisors (1758997089).

3957743421 is a wasteful number, since it uses less digits than its factorization.

3957743421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439749275 (or 439749272 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 3957743421 is about 62910.5986380673. The cubic root of 3957743421 is about 1581.7914068172.

The spelling of 3957743421 in words is "three billion, nine hundred fifty-seven million, seven hundred forty-three thousand, four hundred twenty-one".