400018201968 has 80 divisors (see below), whose sum is σ = 1288370324736. Its totient is φ = 103900830720.

The previous prime is 400018201937. The next prime is 400018202011. The reversal of 400018201968 is 869102810004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54111321 + ... + 54118712.

Almost surely, 2^400018201968 is an apocalyptic number.

400018201968 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

400018201968 is an abundant number, since it is smaller than the sum of its proper divisors (888352122768).

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

400018201968 is a wasteful number, since it uses less digits than its factorization.

400018201968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108230062 (or 108230056 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 400018201968 in words is "four hundred billion, eighteen million, two hundred one thousand, nine hundred sixty-eight".