618783421 has 8 divisors (see below), whose sum is σ = 646012224. Its totient is φ = 591581760.

The previous prime is 618783409. The next prime is 618783443. The reversal of 618783421 is 124387816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 618783421 - 2⁷ = 618783293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (618783401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50026 + ... + 61156.

It is an arithmetic number, because the mean of its divisors is an integer number (80751528).

Almost surely, 2^618783421 is an apocalyptic number.

It is an amenable number.

618783421 is a deficient number, since it is larger than the sum of its proper divisors (27228803).

618783421 is a wasteful number, since it uses less digits than its factorization.

618783421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13571.

The product of its digits is 64512, while the sum is 40.

The square root of 618783421 is about 24875.3577059708. The cubic root of 618783421 is about 852.1438023674.

The spelling of 618783421 in words is "six hundred eighteen million, seven hundred eighty-three thousand, four hundred twenty-one".