1405642650 has 48 divisors (see below), whose sum is σ = 3500668800. Its totient is φ = 373260160.

The previous prime is 1405642649. The next prime is 1405642657. The reversal of 1405642650 is 562465041.

It is not an unprimeable number, because it can be changed into a prime (1405642657) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16246 + ... + 55454.

It is an arithmetic number, because the mean of its divisors is an integer number (72930600).

Almost surely, 2^1405642650 is an apocalyptic number.

1405642650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1405642650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1750334400).

1405642650 is an abundant number, since it is smaller than the sum of its proper divisors (2095026150).

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

1405642650 is a wasteful number, since it uses less digits than its factorization.

1405642650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39463 (or 39458 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 1405642650 is about 37491.9011254431. The cubic root of 1405642650 is about 1120.1898726774.

The spelling of 1405642650 in words is "one billion, four hundred five million, six hundred forty-two thousand, six hundred fifty".