1201887780 has 24 divisors (see below), whose sum is σ = 3365285952. Its totient is φ = 320503392.

The previous prime is 1201887767. The next prime is 1201887781. The reversal of 1201887780 is 877881021.

It is not an unprimeable number, because it can be changed into a prime (1201887781) 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, 10015672 + ... + 10015791.

It is an arithmetic number, because the mean of its divisors is an integer number (140220248).

Almost surely, 2^1201887780 is an apocalyptic number.

1201887780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201887780 is an abundant number, since it is smaller than the sum of its proper divisors (2163398172).

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

1201887780 is a wasteful number, since it uses less digits than its factorization.

1201887780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20031475 (or 20031473 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 42.

The square root of 1201887780 is about 34668.2532008753. The cubic root of 1201887780 is about 1063.2155176728.

The spelling of 1201887780 in words is "one billion, two hundred one million, eight hundred eighty-seven thousand, seven hundred eighty".