351247440 has 80 divisors (see below), whose sum is σ = 1096804800. Its totient is φ = 92983296.

The previous prime is 351247427. The next prime is 351247441. The reversal of 351247440 is 44742153.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 351247398 and 351247407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351247441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28096 + ... + 38624.

It is an arithmetic number, because the mean of its divisors is an integer number (13710060).

Almost surely, 2^351247440 is an apocalyptic number.

351247440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 351247440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (548402400).

351247440 is an abundant number, since it is smaller than the sum of its proper divisors (745557360).

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

351247440 is a wasteful number, since it uses less digits than its factorization.

351247440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10684 (or 10678 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 351247440 is about 18741.5965168392. The cubic root of 351247440 is about 705.5661264275.

Adding to 351247440 its reverse (44742153), we get a palindrome (395989593).

The spelling of 351247440 in words is "three hundred fifty-one million, two hundred forty-seven thousand, four hundred forty".