1200142140 has 24 divisors (see below), whose sum is σ = 3360398160. Its totient is φ = 320037888.

The previous prime is 1200142109. The next prime is 1200142189. The reversal of 1200142140 is 412410021.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10001125 + ... + 10001244.

It is an arithmetic number, because the mean of its divisors is an integer number (140016590).

Almost surely, 2^1200142140 is an apocalyptic number.

1200142140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200142140 is an abundant number, since it is smaller than the sum of its proper divisors (2160256020).

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

1200142140 is a wasteful number, since it uses less digits than its factorization.

1200142140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002381 (or 20002379 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1200142140 is about 34643.0677048093. The cubic root of 1200142140 is about 1062.7005248286.

Adding to 1200142140 its reverse (412410021), we get a palindrome (1612552161).

The spelling of 1200142140 in words is "one billion, two hundred million, one hundred forty-two thousand, one hundred forty".