3742787221 has 16 divisors (see below), whose sum is σ = 3819150000. Its totient is φ = 3667378176.

The previous prime is 3742787203. The next prime is 3742787239. The reversal of 3742787221 is 1227872473.

It is an interprime number because it is at equal distance from previous prime (3742787203) and next prime (3742787239).

It can be written as a sum of positive squares in 8 ways, for example, as 551780100 + 3191007121 = 23490^2 + 56489^2 .

It is a cyclic number.

It is not a de Polignac number, because 3742787221 - 2⁷ = 3742787093 is a prime.

It is a Duffinian number.

Its product of digits (263424) is a multiple of the sum of its prime divisors (1176).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3742787021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8335605 + ... + 8336053.

It is an arithmetic number, because the mean of its divisors is an integer number (238696875).

Almost surely, 2^3742787221 is an apocalyptic number.

It is an amenable number.

3742787221 is a deficient number, since it is larger than the sum of its proper divisors (76362779).

3742787221 is a wasteful number, since it uses less digits than its factorization.

3742787221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

The product of its digits is 263424, while the sum is 43.

The square root of 3742787221 is about 61178.3231300107. The cubic root of 3742787221 is about 1552.6195344997.

The spelling of 3742787221 in words is "three billion, seven hundred forty-two million, seven hundred eighty-seven thousand, two hundred twenty-one".