142404561 has 48 divisors (see below), whose sum is σ = 233804480. Its totient is φ = 86080320.

The previous prime is 142404557. The next prime is 142404571. The reversal of 142404561 is 165404241.

It is not a de Polignac number, because 142404561 - 2² = 142404557 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (142404541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192330 + ... + 193068.

Almost surely, 2^142404561 is an apocalyptic number.

It is an amenable number.

142404561 is a deficient number, since it is larger than the sum of its proper divisors (91399919).

142404561 is an equidigital number, since it uses as much as digits as its factorization.

142404561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 142404561 is about 11933.3382169450. The cubic root of 142404561 is about 522.2053294487.

The spelling of 142404561 in words is "one hundred forty-two million, four hundred four thousand, five hundred sixty-one".