1905660642 has 16 divisors (see below), whose sum is σ = 3850614432. Its totient is φ = 628671360.

The previous prime is 1905660641. The next prime is 1905660643. The reversal of 1905660642 is 2460665091.

It is an interprime number because it is at equal distance from previous prime (1905660641) and next prime (1905660643).

It is a self number, because there is not a number n which added to its sum of digits gives 1905660642.

It is not an unprimeable number, because it can be changed into a prime (1905660641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1636584 + ... + 1637747.

It is an arithmetic number, because the mean of its divisors is an integer number (240663402).

Almost surely, 2^1905660642 is an apocalyptic number.

1905660642 is an abundant number, since it is smaller than the sum of its proper divisors (1944953790).

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

1905660642 is a wasteful number, since it uses less digits than its factorization.

1905660642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3274433.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1905660642 is about 43653.8731614962. The cubic root of 1905660642 is about 1239.7911202963.

The spelling of 1905660642 in words is "one billion, nine hundred five million, six hundred sixty thousand, six hundred forty-two".