400235154640 has 80 divisors (see below), whose sum is σ = 983993020416. Its totient is φ = 151150924800.

The previous prime is 400235154629. The next prime is 400235154659. The reversal of 400235154640 is 46451532004.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 400235154596 and 400235154605.

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, 1866432 + ... + 2069791.

Almost surely, 2^400235154640 is an apocalyptic number.

400235154640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400235154640 is an abundant number, since it is smaller than the sum of its proper divisors (583757865776).

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

400235154640 is a wasteful number, since it uses less digits than its factorization.

400235154640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936308 (or 3936302 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 400235154640 its reverse (46451532004), we get a palindrome (446686686644).

The spelling of 400235154640 in words is "four hundred billion, two hundred thirty-five million, one hundred fifty-four thousand, six hundred forty".