1261840972 has 12 divisors (see below), whose sum is σ = 2523682000. Its totient is φ = 540788976.

The previous prime is 1261840961. The next prime is 1261841003. The reversal of 1261840972 is 2790481621.

1261840972 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22532847 + ... + 22532902.

Almost surely, 2^1261840972 is an apocalyptic number.

It is an amenable number.

1261840972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1261840972 is a wasteful number, since it uses less digits than its factorization.

1261840972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45065760 (or 45065758 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1261840972 is about 35522.4009886719. The cubic root of 1261840972 is about 1080.6080743515.

The spelling of 1261840972 in words is "one billion, two hundred sixty-one million, eight hundred forty thousand, nine hundred seventy-two".