1542123440 has 160 divisors (see below), whose sum is σ = 4243228416. Its totient is φ = 513838080.

The previous prime is 1542123403. The next prime is 1542123509. The reversal of 1542123440 is 443212451.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1864307 + ... + 1865133.

Almost surely, 2^1542123440 is an apocalyptic number.

1542123440 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 1542123440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2121614208).

1542123440 is an abundant number, since it is smaller than the sum of its proper divisors (2701104976).

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

1542123440 is a wasteful number, since it uses less digits than its factorization.

1542123440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1021 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1542123440 is about 39269.8795516360. The cubic root of 1542123440 is about 1155.3308747642.

Adding to 1542123440 its reverse (443212451), we get a palindrome (1985335891).

The spelling of 1542123440 in words is "one billion, five hundred forty-two million, one hundred twenty-three thousand, four hundred forty".