1261899 has 16 divisors (see below), whose sum is σ = 1895840. Its totient is φ = 839808.

The previous prime is 1261891. The next prime is 1261901. The reversal of 1261899 is 9981621.

It is not a de Polignac number, because 1261899 - 2³ = 1261891 is a prime.

It is a Duffinian number.

1261899 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1899 + ... + 2475.

It is an arithmetic number, because the mean of its divisors is an integer number (118490).

2^1261899 is an apocalyptic number.

1261899 is a deficient number, since it is larger than the sum of its proper divisors (633941).

1261899 is an frugal number, since it uses more digits than its factorization.

1261899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598 (or 580 counting only the distinct ones).

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

The square root of 1261899 is about 1123.3427793866. The cubic root of 1261899 is about 108.0624638659.

It can be divided in two parts, 126 and 1899, that added together give a square (2025 = 45²).

The spelling of 1261899 in words is "one million, two hundred sixty-one thousand, eight hundred ninety-nine".