720385903 has 4 divisors (see below), whose sum is σ = 720442840. Its totient is φ = 720328968.

The previous prime is 720385901. The next prime is 720385957. The reversal of 720385903 is 309583027.

720385903 is a nontrivial binomial coefficient, being equal to C(37958, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(720385903) divides (720385903-1)³.

It is a cyclic number.

It is not a de Polignac number, because 720385903 - 2¹ = 720385901 is a prime.

It is a super-2 number, since 2×720385903² = 1037911698482250818, which contains 22 as substring.

It is a deceptive number, since it divides R_720385902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720385901) 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, 1 + ... + 37957.

It is an arithmetic number, because the mean of its divisors is an integer number (180110710).

Almost surely, 2^720385903 is an apocalyptic number.

720385903 is the 37957-th triangular number and also the 18979-th hexagonal number.

720385903 is the 12653-rd centered nonagonal number.

720385903 is a deficient number, since it is larger than the sum of its proper divisors (56937).

720385903 is a wasteful number, since it uses less digits than its factorization.

720385903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56936.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 720385903 is about 26840.0056445598. The cubic root of 720385903 is about 896.4410491871.

The spelling of 720385903 in words is "seven hundred twenty million, three hundred eighty-five thousand, nine hundred three".