720938394 has 160 divisors (see below), whose sum is σ = 1881792000. Its totient is φ = 204003360.

The previous prime is 720938389. The next prime is 720938399. The reversal of 720938394 is 493839027.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (720938389) and next prime (720938399).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (720938399) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3622707 + ... + 3622905.

It is an arithmetic number, because the mean of its divisors is an integer number (11761200).

Almost surely, 2^720938394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720938394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940896000).

720938394 is an abundant number, since it is smaller than the sum of its proper divisors (1160853606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720938394 is a wasteful number, since it uses less digits than its factorization.

720938394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 720938394 is about 26850.2959760223. The cubic root of 720938394 is about 896.6701620596.

The spelling of 720938394 in words is "seven hundred twenty million, nine hundred thirty-eight thousand, three hundred ninety-four".