142921810 has 16 divisors (see below), whose sum is σ = 258900696. Its totient is φ = 56803968.

The previous prime is 142921799. The next prime is 142921813. The reversal of 142921810 is 18129241.

It can be written as a sum of positive squares in 4 ways, for example, as 119311929 + 23609881 = 10923^2 + 4859^2 .

It is a super-2 number, since 2×142921810² = 40853287547352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (142921813) 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, 43947 + ... + 47086.

Almost surely, 2^142921810 is an apocalyptic number.

142921810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

142921810 is a deficient number, since it is larger than the sum of its proper divisors (115978886).

142921810 is a wasteful number, since it uses less digits than its factorization.

142921810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91197.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 142921810 is about 11954.9910079431. The cubic root of 142921810 is about 522.8368256240.

The spelling of 142921810 in words is "one hundred forty-two million, nine hundred twenty-one thousand, eight hundred ten".