1261055420 has 24 divisors (see below), whose sum is σ = 2649280704. Its totient is φ = 504219456.

The previous prime is 1261055413. The next prime is 1261055443. The reversal of 1261055420 is 245501621.

It is a super-2 number, since 2×1261055420² = 3180521544622752800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261055420.

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, 44669 + ... + 67211.

It is an arithmetic number, because the mean of its divisors is an integer number (110386696).

Almost surely, 2^1261055420 is an apocalyptic number.

1261055420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261055420 is an abundant number, since it is smaller than the sum of its proper divisors (1388225284).

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

1261055420 is a wasteful number, since it uses less digits than its factorization.

1261055420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25349 (or 25347 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1261055420 is about 35511.3421317753. The cubic root of 1261055420 is about 1080.3837856422.

The spelling of 1261055420 in words is "one billion, two hundred sixty-one million, fifty-five thousand, four hundred twenty".