2190402078 has 8 divisors (see below), whose sum is σ = 4380804168. Its totient is φ = 730134024.

The previous prime is 2190402047. The next prime is 2190402101. The reversal of 2190402078 is 8702040912.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

2190402078 is an admirable number.

It is a super-2 number, since 2×2190402078² = 9595722526613436168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182533501 + ... + 182533512.

It is an arithmetic number, because the mean of its divisors is an integer number (547600521).

Almost surely, 2^2190402078 is an apocalyptic number.

2190402078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2190402078 is a wasteful number, since it uses less digits than its factorization.

2190402078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365067018.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 2190402078 is about 46801.7315705306. The cubic root of 2190402078 is about 1298.6973298041.

The spelling of 2190402078 in words is "two billion, one hundred ninety million, four hundred two thousand, seventy-eight".