142691220 has 120 divisors (see below), whose sum is σ = 511615104. Its totient is φ = 32612544.

The previous prime is 142691209. The next prime is 142691221. The reversal of 142691220 is 22196241.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142691221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5049 + ... + 17631.

Almost surely, 2^142691220 is an apocalyptic number.

142691220 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 142691220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255807552).

142691220 is an abundant number, since it is smaller than the sum of its proper divisors (368923884).

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

142691220 is a wasteful number, since it uses less digits than its factorization.

142691220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12611 (or 12600 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 142691220 is about 11945.3430256314. The cubic root of 142691220 is about 522.5554926829. Note that the first 3 decimals are identical.

The spelling of 142691220 in words is "one hundred forty-two million, six hundred ninety-one thousand, two hundred twenty".