142821520 has 40 divisors (see below), whose sum is σ = 343515960. Its totient is φ = 55157760.

The previous prime is 142821479. The next prime is 142821529. The reversal of 142821520 is 25128241.

It can be written as a sum of positive squares in 4 ways, for example, as 38291344 + 104530176 = 6188^2 + 10224^2 .

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

It is a super-2 number, since 2×142821520² = 40795973150220800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142821529) 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, 28461 + ... + 33100.

It is an arithmetic number, because the mean of its divisors is an integer number (8587899).

Almost surely, 2^142821520 is an apocalyptic number.

142821520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

142821520 is an abundant number, since it is smaller than the sum of its proper divisors (200694440).

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

142821520 is a wasteful number, since it uses less digits than its factorization.

142821520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61603 (or 61597 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 142821520 is about 11950.7957894025. The cubic root of 142821520 is about 522.7145033210.

Adding to 142821520 its reverse (25128241), we get a palindrome (167949761).

It can be divided in two parts, 142821 and 520, that added together give a palindrome (143341).

The spelling of 142821520 in words is "one hundred forty-two million, eight hundred twenty-one thousand, five hundred twenty".