1871363778 has 16 divisors (see below), whose sum is σ = 3751665120. Its totient is φ = 622298336.

The previous prime is 1871363773. The next prime is 1871363783. The reversal of 1871363778 is 8773631781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1871363773) and next prime (1871363783).

It is a super-2 number, since 2×1871363778² = 7004004779220866568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1871363778.

It is not an unprimeable number, because it can be changed into a prime (1871363773) 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, 369675 + ... + 374702.

It is an arithmetic number, because the mean of its divisors is an integer number (234479070).

Almost surely, 2^1871363778 is an apocalyptic number.

1871363778 is an abundant number, since it is smaller than the sum of its proper divisors (1880301342).

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

1871363778 is a wasteful number, since it uses less digits than its factorization.

1871363778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744801.

The product of its digits is 1185408, while the sum is 51.

The square root of 1871363778 is about 43259.2623376775. The cubic root of 1871363778 is about 1232.3083929051.

The spelling of 1871363778 in words is "one billion, eight hundred seventy-one million, three hundred sixty-three thousand, seven hundred seventy-eight".