620406249 has 4 divisors (see below), whose sum is σ = 827208336. Its totient is φ = 413604164.

The previous prime is 620406247. The next prime is 620406253. The reversal of 620406249 is 942604026.

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.

It is a cyclic number.

It is not a de Polignac number, because 620406249 - 2¹ = 620406247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (620406247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103401039 + ... + 103401044.

It is an arithmetic number, because the mean of its divisors is an integer number (206802084).

Almost surely, 2^620406249 is an apocalyptic number.

It is an amenable number.

620406249 is a deficient number, since it is larger than the sum of its proper divisors (206802087).

620406249 is a wasteful number, since it uses less digits than its factorization.

620406249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206802086.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 620406249 is about 24907.9555363342. The cubic root of 620406249 is about 852.8880992209. Note that the first 3 decimals are identical.

The spelling of 620406249 in words is "six hundred twenty million, four hundred six thousand, two hundred forty-nine".