720421893 has 12 divisors (see below), whose sum is σ = 1085853600. Its totient is φ = 459399336.

The previous prime is 720421883. The next prime is 720421901. The reversal of 720421893 is 398124027.

It is not a de Polignac number, because 720421893 - 2⁶ = 720421829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720421883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1739943 + ... + 1740356.

It is an arithmetic number, because the mean of its divisors is an integer number (90487800).

Almost surely, 2^720421893 is an apocalyptic number.

It is an amenable number.

720421893 is a deficient number, since it is larger than the sum of its proper divisors (365431707).

720421893 is a wasteful number, since it uses less digits than its factorization.

720421893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480328 (or 3480325 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 720421893 is about 26840.6760905906. The cubic root of 720421893 is about 896.4559774712.

The spelling of 720421893 in words is "seven hundred twenty million, four hundred twenty-one thousand, eight hundred ninety-three".