3872346421 has 2 divisors, whose sum is σ = 3872346422. Its totient is φ = 3872346420.

The previous prime is 3872346391. The next prime is 3872346427. The reversal of 3872346421 is 1246432783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2997015025 + 875331396 = 54745^2 + 29586^2 .

It is an emirp because it is prime and its reverse (1246432783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3872346421 - 2⁷ = 3872346293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3872346427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1936173210 + 1936173211.

It is an arithmetic number, because the mean of its divisors is an integer number (1936173211).

Almost surely, 2^3872346421 is an apocalyptic number.

It is an amenable number.

3872346421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3872346421 is an equidigital number, since it uses as much as digits as its factorization.

3872346421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 40.

The square root of 3872346421 is about 62228.1802803199. The cubic root of 3872346421 is about 1570.3317109162.

The spelling of 3872346421 in words is "three billion, eight hundred seventy-two million, three hundred forty-six thousand, four hundred twenty-one".