1200129990 has 16 divisors (see below), whose sum is σ = 2880312048. Its totient is φ = 320034656.

The previous prime is 1200129989. The next prime is 1200130021. The reversal of 1200129990 is 999210021.

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, 20002137 + ... + 20002196.

It is an arithmetic number, because the mean of its divisors is an integer number (180019503).

Almost surely, 2^1200129990 is an apocalyptic number.

1200129990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1200129990 is an abundant number, since it is smaller than the sum of its proper divisors (1680182058).

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

1200129990 is a wasteful number, since it uses less digits than its factorization.

1200129990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40004343.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1200129990 is about 34642.8923446066. The cubic root of 1200129990 is about 1062.6969386270.

The spelling of 1200129990 in words is "one billion, two hundred million, one hundred twenty-nine thousand, nine hundred ninety".