201402147978 has 32 divisors (see below), whose sum is σ = 447584140800. Its totient is φ = 67130477568.

The previous prime is 201402147971. The next prime is 201402147997. The reversal of 201402147978 is 879741204102.

It is not an unprimeable number, because it can be changed into a prime (201402147971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1046538 + ... + 1223946.

It is an arithmetic number, because the mean of its divisors is an integer number (13987004400).

Almost surely, 2^201402147978 is an apocalyptic number.

201402147978 is an abundant number, since it is smaller than the sum of its proper divisors (246181992822).

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

201402147978 is a wasteful number, since it uses less digits than its factorization.

201402147978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198443 (or 198437 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 201402147978 in words is "two hundred one billion, four hundred two million, one hundred forty-seven thousand, nine hundred seventy-eight".