1200261690 has 24 divisors (see below), whose sum is σ = 3120680628. Its totient is φ = 320069760.

The previous prime is 1200261641. The next prime is 1200261731. The reversal of 1200261690 is 961620021.

It can be written as a sum of positive squares in 2 ways, for example, as 1182190689 + 18071001 = 34383^2 + 4251^2 .

It is a super-2 number, since 2×1200261690² = 2881256248963312200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6668031 + ... + 6668210.

Almost surely, 2^1200261690 is an apocalyptic number.

1200261690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1200261690 is an abundant number, since it is smaller than the sum of its proper divisors (1920418938).

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

1200261690 is a wasteful number, since it uses less digits than its factorization.

1200261690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336254 (or 13336251 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1200261690 is about 34644.7931152720. The cubic root of 1200261690 is about 1062.7358099906.

The spelling of 1200261690 in words is "one billion, two hundred million, two hundred sixty-one thousand, six hundred ninety".