400865659542 has 48 divisors (see below), whose sum is σ = 890224650432. Its totient is φ = 130306665600.

The previous prime is 400865659499. The next prime is 400865659561. The reversal of 400865659542 is 245956568004.

400865659542 is a `hidden beast` number, since 4 + 0 + 0 + 8 + 6 + 5 + 6 + 595 + 42 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 620959 + ... + 1089642.

It is an arithmetic number, because the mean of its divisors is an integer number (18546346884).

Almost surely, 2^400865659542 is an apocalyptic number.

400865659542 is an abundant number, since it is smaller than the sum of its proper divisors (489358990890).

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

400865659542 is a wasteful number, since it uses less digits than its factorization.

400865659542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710933 (or 1710930 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 54.

The spelling of 400865659542 in words is "four hundred billion, eight hundred sixty-five million, six hundred fifty-nine thousand, five hundred forty-two".