618784401 has 4 divisors (see below), whose sum is σ = 825045872. Its totient is φ = 412522932.

The previous prime is 618784399. The next prime is 618784409. The reversal of 618784401 is 104487816.

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 not a de Polignac number, because 618784401 - 2¹ = 618784399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618784401.

It is not an unprimeable number, because it can be changed into a prime (618784409) 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, 103130731 + ... + 103130736.

It is an arithmetic number, because the mean of its divisors is an integer number (206261468).

Almost surely, 2^618784401 is an apocalyptic number.

It is an amenable number.

618784401 is a deficient number, since it is larger than the sum of its proper divisors (206261471).

618784401 is a wasteful number, since it uses less digits than its factorization.

618784401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206261470.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 618784401 is about 24875.3774041722. The cubic root of 618784401 is about 852.1442522289.

The spelling of 618784401 in words is "six hundred eighteen million, seven hundred eighty-four thousand, four hundred one".