15400240 has 40 divisors (see below), whose sum is σ = 36055728. Its totient is φ = 6117120.

The previous prime is 15400237. The next prime is 15400277. The reversal of 15400240 is 4200451.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 12450 + ... + 13630.

Almost surely, 2^15400240 is an apocalyptic number.

15400240 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 15400240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18027864).

15400240 is an abundant number, since it is smaller than the sum of its proper divisors (20655488).

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

15400240 is a wasteful number, since it uses less digits than its factorization.

15400240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 15400240 is about 3924.3139527821. The cubic root of 15400240 is about 248.7954859036.

Adding to 15400240 its reverse (4200451), we get a palindrome (19600691).

The spelling of 15400240 in words is "fifteen million, four hundred thousand, two hundred forty".