15942420 has 120 divisors (see below), whose sum is σ = 53930184. Its totient is φ = 3919104.

The previous prime is 15942419. The next prime is 15942439. The reversal of 15942420 is 2424951.

It can be written as a sum of positive squares in 4 ways, for example, as 544644 + 15397776 = 738^2 + 3924^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 20682 + ... + 21438.

Almost surely, 2^15942420 is an apocalyptic number.

15942420 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 15942420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26965092).

15942420 is an abundant number, since it is smaller than the sum of its proper divisors (37987764).

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

15942420 is a wasteful number, since it uses less digits than its factorization.

15942420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 15942420 is about 3992.7960128211. The cubic root of 15942420 is about 251.6815705884.

The spelling of 15942420 in words is "fifteen million, nine hundred forty-two thousand, four hundred twenty".