15640834 has 16 divisors (see below), whose sum is σ = 25947360. Its totient is φ = 7011360.

The previous prime is 15640829. The next prime is 15640837. The reversal of 15640834 is 43804651.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15640796 and 15640805.

It is not an unprimeable number, because it can be changed into a prime (15640837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3264 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (1621710).

Almost surely, 2^15640834 is an apocalyptic number.

15640834 is a deficient number, since it is larger than the sum of its proper divisors (10306526).

15640834 is a wasteful number, since it uses less digits than its factorization.

15640834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9825.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 15640834 is about 3954.8494282336. The cubic root of 15640834 is about 250.0844194902.

The spelling of 15640834 in words is "fifteen million, six hundred forty thousand, eight hundred thirty-four".