1199640 has 64 divisors (see below), whose sum is σ = 3880800. Its totient is φ = 294912.

The previous prime is 1199629. The next prime is 1199659. The reversal of 1199640 is 469911.

It is a super-2 number, since 2×1199640² = 2878272259200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1199598 and 1199607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176 + ... + 1944.

2^1199640 is an apocalyptic number.

1199640 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 1199640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1940400).

1199640 is an abundant number, since it is smaller than the sum of its proper divisors (2681160).

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

1199640 is a wasteful number, since it uses less digits than its factorization.

1199640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1199640 is about 1095.2807859175. The cubic root of 1199640 is about 106.2552292697.

The spelling of 1199640 in words is "one million, one hundred ninety-nine thousand, six hundred forty".