1542240 has 240 divisors, whose sum is σ = 6586272. Its totient is φ = 331776.

The previous prime is 1542239. The next prime is 1542251. The reversal of 1542240 is 422451.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 90712 + ... + 90728.

2^1542240 is an apocalyptic number.

1542240 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 1542240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3293136).

1542240 is an abundant number, since it is smaller than the sum of its proper divisors (5044032).

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

1542240 is a wasteful number, since it uses less digits than its factorization.

1542240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1542240 is about 1241.8695583675. The cubic root of 1542240 is about 115.5359982243.

Adding to 1542240 its reverse (422451), we get a palindrome (1964691).

The spelling of 1542240 in words is "one million, five hundred forty-two thousand, two hundred forty".