15140640 has 48 divisors (see below), whose sum is σ = 47694528. Its totient is φ = 4037376.

The previous prime is 15140621. The next prime is 15140689. The reversal of 15140640 is 4604151.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15292 + ... + 16251.

It is an arithmetic number, because the mean of its divisors is an integer number (993636).

Almost surely, 2^15140640 is an apocalyptic number.

15140640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15140640 is an abundant number, since it is smaller than the sum of its proper divisors (32553888).

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

15140640 is a wasteful number, since it uses less digits than its factorization.

15140640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31561 (or 31553 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 15140640 is about 3891.0975315456. The cubic root of 15140640 is about 247.3895844592.

Adding to 15140640 its reverse (4604151), we get a palindrome (19744791).

The spelling of 15140640 in words is "fifteen million, one hundred forty thousand, six hundred forty".