5402979721 has 4 divisors (see below), whose sum is σ = 5430406212. Its totient is φ = 5375553232.

The previous prime is 5402979719. The next prime is 5402979727. The reversal of 5402979721 is 1279792045.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4724637696 + 678342025 = 68736^2 + 26045^2 .

It is a cyclic number.

It is not a de Polignac number, because 5402979721 - 2¹ = 5402979719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5402979727) 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, 13712950 + ... + 13713343.

It is an arithmetic number, because the mean of its divisors is an integer number (1357601553).

Almost surely, 2^5402979721 is an apocalyptic number.

It is an amenable number.

5402979721 is a deficient number, since it is larger than the sum of its proper divisors (27426491).

5402979721 is a wasteful number, since it uses less digits than its factorization.

5402979721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27426490.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 5402979721 is about 73504.9639208129. The cubic root of 5402979721 is about 1754.7332782975.

The spelling of 5402979721 in words is "five billion, four hundred two million, nine hundred seventy-nine thousand, seven hundred twenty-one".