3962269821 has 4 divisors (see below), whose sum is σ = 5283026432. Its totient is φ = 2641513212.

The previous prime is 3962269819. The next prime is 3962269841. The reversal of 3962269821 is 1289622693.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1289622693 = 3 ⋅429874231.

It is not a de Polignac number, because 3962269821 - 2¹ = 3962269819 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3962269841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660378301 + ... + 660378306.

It is an arithmetic number, because the mean of its divisors is an integer number (1320756608).

Almost surely, 2^3962269821 is an apocalyptic number.

It is an amenable number.

3962269821 is a deficient number, since it is larger than the sum of its proper divisors (1320756611).

3962269821 is a wasteful number, since it uses less digits than its factorization.

3962269821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320756610.

The product of its digits is 559872, while the sum is 48.

The square root of 3962269821 is about 62946.5632183362. The cubic root of 3962269821 is about 1582.3941992063.

The spelling of 3962269821 in words is "three billion, nine hundred sixty-two million, two hundred sixty-nine thousand, eight hundred twenty-one".