142549890 has 32 divisors (see below), whose sum is σ = 390994560. Its totient is φ = 32582784.

The previous prime is 142549861. The next prime is 142549909. The reversal of 142549890 is 98945241.

It is a super-2 number, since 2×142549890² = 40640942278024200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339195 + ... + 339614.

It is an arithmetic number, because the mean of its divisors is an integer number (12218580).

Almost surely, 2^142549890 is an apocalyptic number.

142549890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

142549890 is an abundant number, since it is smaller than the sum of its proper divisors (248444670).

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

142549890 is a wasteful number, since it uses less digits than its factorization.

142549890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678826.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 142549890 is about 11939.4258655934. The cubic root of 142549890 is about 522.3829121884.

It can be divided in two parts, 1425 and 49890, that added together give a palindrome (51315).

The spelling of 142549890 in words is "one hundred forty-two million, five hundred forty-nine thousand, eight hundred ninety".