3915627421 has 8 divisors (see below), whose sum is σ = 3957242744. Its totient is φ = 3874037760.

The previous prime is 3915627409. The next prime is 3915627491. The reversal of 3915627421 is 1247265193.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 622521 + 3915004900 = 789^2 + 62570^2 .

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 3915627421 - 2¹⁹ = 3915103133 is a prime.

It is a super-2 number, since 2×3915627421² = 30664276200174222482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3915627491) 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, 574051 + ... + 580831.

It is an arithmetic number, because the mean of its divisors is an integer number (494655343).

Almost surely, 2^3915627421 is an apocalyptic number.

It is an amenable number.

3915627421 is a deficient number, since it is larger than the sum of its proper divisors (41615323).

3915627421 is an equidigital number, since it uses as much as digits as its factorization.

3915627421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12831.

The product of its digits is 90720, while the sum is 40.

The square root of 3915627421 is about 62574.9743987163. The cubic root of 3915627421 is about 1576.1605516658.

The spelling of 3915627421 in words is "three billion, nine hundred fifteen million, six hundred twenty-seven thousand, four hundred twenty-one".