1201055640 has 128 divisors (see below), whose sum is σ = 3729136320. Its totient is φ = 309248000.

The previous prime is 1201055629. The next prime is 1201055651. The reversal of 1201055640 is 465501021.

It is an interprime number because it is at equal distance from previous prime (1201055629) and next prime (1201055651).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1201055640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495712 + ... + 498128.

Almost surely, 2^1201055640 is an apocalyptic number.

1201055640 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 1201055640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1864568160).

1201055640 is an abundant number, since it is smaller than the sum of its proper divisors (2528080680).

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

1201055640 is a wasteful number, since it uses less digits than its factorization.

1201055640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1201055640 is about 34656.2496528404. The cubic root of 1201055640 is about 1062.9700847681.

Adding to 1201055640 its reverse (465501021), we get a palindrome (1666556661).

The spelling of 1201055640 in words is "one billion, two hundred one million, fifty-five thousand, six hundred forty".