1261988 has 24 divisors (see below), whose sum is σ = 2718912. Its totient is φ = 499104.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261988 is 8891621.

It is a super-2 number, since 2×1261988² = 3185227424288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 1370 + ... + 2097.

It is an arithmetic number, because the mean of its divisors is an integer number (113288).

2^1261988 is an apocalyptic number.

It is an amenable number.

1261988 is an abundant number, since it is smaller than the sum of its proper divisors (1456924).

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

1261988 is a wasteful number, since it uses less digits than its factorization.

1261988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491 (or 3489 counting only the distinct ones).

The product of its digits is 6912, while the sum is 35.

The square root of 1261988 is about 1123.3823925984. The cubic root of 1261988 is about 108.0650043051.

The spelling of 1261988 in words is "one million, two hundred sixty-one thousand, nine hundred eighty-eight".