2406921639 has 4 divisors (see below), whose sum is σ = 3209228856. Its totient is φ = 1604614424.

The previous prime is 2406921619. The next prime is 2406921661. The reversal of 2406921639 is 9361296042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2406921639 - 2¹⁵ = 2406888871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2406921639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2406921619) 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, 401153604 + ... + 401153609.

It is an arithmetic number, because the mean of its divisors is an integer number (802307214).

Almost surely, 2^2406921639 is an apocalyptic number.

2406921639 is a deficient number, since it is larger than the sum of its proper divisors (802307217).

2406921639 is an equidigital number, since it uses as much as digits as its factorization.

2406921639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802307216.

The product of its (nonzero) digits is 139968, while the sum is 42.

The square root of 2406921639 is about 49060.3876768213. The cubic root of 2406921639 is about 1340.1517684713.

The spelling of 2406921639 in words is "two billion, four hundred six million, nine hundred twenty-one thousand, six hundred thirty-nine".