1211904 has 60 divisors (see below), whose sum is σ = 3510936. Its totient is φ = 402432.

The previous prime is 1211897. The next prime is 1211911. The reversal of 1211904 is 4091121.

It is an interprime number because it is at equal distance from previous prime (1211897) and next prime (1211911).

It is a super-2 number, since 2×1211904² = 2937422610432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 8.

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, 4477 + ... + 4739.

2^1211904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1755468).

1211904 is an abundant number, since it is smaller than the sum of its proper divisors (2299032).

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

1211904 is an equidigital number, since it uses as much as digits as its factorization.

1211904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1211904 is about 1100.8651143533. The cubic root of 1211904 is about 106.6160871309.

It can be divided in two parts, 121 and 1904, that added together give a square (2025 = 45²).

The spelling of 1211904 in words is "one million, two hundred eleven thousand, nine hundred four".