1878722402 has 6 divisors (see below), whose sum is σ = 2818175553. Its totient is φ = 939330552.

The previous prime is 1878722393. The next prime is 1878722431. The reversal of 1878722402 is 2042278781.

It can be written as a sum of positive squares in 2 ways, for example, as 1194324481 + 684397921 = 34559^2 + 26161^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=30649.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1878722402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 45974 + ... + 76622.

Almost surely, 2^1878722402 is an apocalyptic number.

1878722402 is a deficient number, since it is larger than the sum of its proper divisors (939453151).

1878722402 is an frugal number, since it uses more digits than its factorization.

1878722402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61300 (or 30651 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 1878722402 is about 43344.2314731730. The cubic root of 1878722402 is about 1233.9215184395.

Multiplying 1878722402 by its product of nonzero digits (100352), we get a square (188533550485504 = 13730752²).

The spelling of 1878722402 in words is "one billion, eight hundred seventy-eight million, seven hundred twenty-two thousand, four hundred two".