1402178778 has 192 divisors, whose sum is σ = 4151347200. Its totient is φ = 330238080.

The previous prime is 1402178761. The next prime is 1402178801. The reversal of 1402178778 is 8778712041.

1402178778 is a `hidden beast` number, since 1 + 402 + 178 + 7 + 78 = 666.

1402178778 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1402178778² = 3932210650947146568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1062403 + ... + 1063721.

It is an arithmetic number, because the mean of its divisors is an integer number (21621600).

Almost surely, 2^1402178778 is an apocalyptic number.

1402178778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1402178778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2075673600).

1402178778 is an abundant number, since it is smaller than the sum of its proper divisors (2749168422).

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

1402178778 is a wasteful number, since it uses less digits than its factorization.

1402178778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417 (or 1414 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 1402178778 is about 37445.6776944950. The cubic root of 1402178778 is about 1119.2689686394.

The spelling of 1402178778 in words is "one billion, four hundred two million, one hundred seventy-eight thousand, seven hundred seventy-eight".