1202399640 has 160 divisors (see below), whose sum is σ = 4352428080. Its totient is φ = 295964928.

The previous prime is 1202399633. The next prime is 1202399641. The reversal of 1202399640 is 469932021.

1202399640 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 3 + 9 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1202399595 and 1202399604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202399641) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27847 + ... + 56393.

Almost surely, 2^1202399640 is an apocalyptic number.

1202399640 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 1202399640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176214040).

1202399640 is an abundant number, since it is smaller than the sum of its proper divisors (3150028440).

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

1202399640 is a wasteful number, since it uses less digits than its factorization.

1202399640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28583 (or 28570 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1202399640 is about 34675.6346733553. The cubic root of 1202399640 is about 1063.3664303357.

The spelling of 1202399640 in words is "one billion, two hundred two million, three hundred ninety-nine thousand, six hundred forty".