1261998 has 12 divisors (see below), whose sum is σ = 2734368. Its totient is φ = 420660.

The previous prime is 1261973. The next prime is 1262011. The reversal of 1261998 is 8991621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35038 + ... + 35073.

It is an arithmetic number, because the mean of its divisors is an integer number (227864).

2^1261998 is an apocalyptic number.

1261998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1261998 is an abundant number, since it is smaller than the sum of its proper divisors (1472370).

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

1261998 is a wasteful number, since it uses less digits than its factorization.

1261998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70119 (or 70116 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1261998 is about 1123.3868434337. The cubic root of 1261998 is about 108.0652897402.

The spelling of 1261998 in words is "one million, two hundred sixty-one thousand, nine hundred ninety-eight".