1261477884 has 12 divisors (see below), whose sum is σ = 2943448424. Its totient is φ = 420492624.

The previous prime is 1261477883. The next prime is 1261477913. The reversal of 1261477884 is 4887741621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1261477884² = 3182652903642234912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261477883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52561567 + ... + 52561590.

Almost surely, 2^1261477884 is an apocalyptic number.

It is an amenable number.

1261477884 is an abundant number, since it is smaller than the sum of its proper divisors (1681970540).

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

1261477884 is a wasteful number, since it uses less digits than its factorization.

1261477884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105123164 (or 105123162 counting only the distinct ones).

The product of its digits is 602112, while the sum is 48.

The square root of 1261477884 is about 35517.2899303987. The cubic root of 1261477884 is about 1080.5044180081.

The spelling of 1261477884 in words is "one billion, two hundred sixty-one million, four hundred seventy-seven thousand, eight hundred eighty-four".