15438340 has 12 divisors (see below), whose sum is σ = 32420556. Its totient is φ = 6175328.

The previous prime is 15438323. The next prime is 15438457. The reversal of 15438340 is 4383451.

It can be written as a sum of positive squares in 2 ways, for example, as 4468996 + 10969344 = 2114^2 + 3312^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15438299 and 15438308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385939 + ... + 385978.

It is an arithmetic number, because the mean of its divisors is an integer number (2701713).

Almost surely, 2^15438340 is an apocalyptic number.

15438340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15438340 is an abundant number, since it is smaller than the sum of its proper divisors (16982216).

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

15438340 is a wasteful number, since it uses less digits than its factorization.

15438340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771926 (or 771924 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 15438340 is about 3929.1653057615. The cubic root of 15438340 is about 249.0004892385. Note that the first 3 decimals are identical.

The spelling of 15438340 in words is "fifteen million, four hundred thirty-eight thousand, three hundred forty".