15420340 has 48 divisors (see below), whose sum is σ = 35223552. Its totient is φ = 5636736.

The previous prime is 15420331. The next prime is 15420341. The reversal of 15420340 is 4302451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420341) 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, 32787 + ... + 33253.

It is an arithmetic number, because the mean of its divisors is an integer number (733824).

Almost surely, 2^15420340 is an apocalyptic number.

15420340 is a gapful number since it is divisible by the number (10) 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 15420340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17611776).

15420340 is an abundant number, since it is smaller than the sum of its proper divisors (19803212).

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

15420340 is a wasteful number, since it uses less digits than its factorization.

15420340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 15420340 is about 3926.8740748845. The cubic root of 15420340 is about 248.9036793518.

Adding to 15420340 its reverse (4302451), we get a palindrome (19722791).

The spelling of 15420340 in words is "fifteen million, four hundred twenty thousand, three hundred forty".