3620707921 has 4 divisors (see below), whose sum is σ = 3664330992. Its totient is φ = 3577084852.

The previous prime is 3620707877. The next prime is 3620707931. The reversal of 3620707921 is 1297070263.

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: 1297070263 = 1249 ⋅1038487.

It is a cyclic number.

It is not a de Polignac number, because 3620707921 - 2¹⁷ = 3620576849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3620707931) 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, 21811411 + ... + 21811576.

It is an arithmetic number, because the mean of its divisors is an integer number (916082748).

Almost surely, 2^3620707921 is an apocalyptic number.

It is an amenable number.

3620707921 is a deficient number, since it is larger than the sum of its proper divisors (43623071).

3620707921 is an equidigital number, since it uses as much as digits as its factorization.

3620707921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43623070.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 3620707921 is about 60172.3185609463. The cubic root of 3620707921 is about 1535.5518917223.

The spelling of 3620707921 in words is "three billion, six hundred twenty million, seven hundred seven thousand, nine hundred twenty-one".