721412440 has 32 divisors (see below), whose sum is σ = 1855061280. Its totient is φ = 247341312.

The previous prime is 721412407. The next prime is 721412443. The reversal of 721412440 is 44214127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721412443) 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, 1287957 + ... + 1288516.

It is an arithmetic number, because the mean of its divisors is an integer number (57970665).

Almost surely, 2^721412440 is an apocalyptic number.

721412440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

721412440 is an abundant number, since it is smaller than the sum of its proper divisors (1133648840).

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

721412440 is a wasteful number, since it uses less digits than its factorization.

721412440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576491 (or 2576487 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 721412440 is about 26859.1221003219. The cubic root of 721412440 is about 896.8666512353.

Adding to 721412440 its reverse (44214127), we get a palindrome (765626567).

The spelling of 721412440 in words is "seven hundred twenty-one million, four hundred twelve thousand, four hundred forty".