15542140 has 24 divisors (see below), whose sum is σ = 32739840. Its totient is φ = 6197568.

The previous prime is 15542119. The next prime is 15542143. The reversal of 15542140 is 4124551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15542143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6646 + ... + 8674.

It is an arithmetic number, because the mean of its divisors is an integer number (1364160).

Almost surely, 2^15542140 is an apocalyptic number.

15542140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15542140 is an abundant number, since it is smaller than the sum of its proper divisors (17197700).

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

15542140 is a wasteful number, since it uses less digits than its factorization.

15542140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421 (or 2419 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 15542140 is about 3942.3520898063. The cubic root of 15542140 is about 249.5572965172.

Adding to 15542140 its reverse (4124551), we get a palindrome (19666691).

The spelling of 15542140 in words is "fifteen million, five hundred forty-two thousand, one hundred forty".