1213940 has 96 divisors (see below), whose sum is σ = 3386880. Its totient is φ = 354816.

The previous prime is 1213939. The next prime is 1213943. The reversal of 1213940 is 493121.

1213940 = T₂₆ + T₂₇ + ... + T₁₉₃.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41846 + ... + 41874.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2^1213940 is an apocalyptic number.

1213940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1693440).

1213940 is an abundant number, since it is smaller than the sum of its proper divisors (2172940).

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

1213940 is a wasteful number, since it uses less digits than its factorization.

1213940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1213940 is about 1101.7894535709. The cubic root of 1213940 is about 106.6757587736.

The spelling of 1213940 in words is "one million, two hundred thirteen thousand, nine hundred forty".