400387540 has 48 divisors (see below), whose sum is σ = 962438400. Its totient is φ = 137060352.

The previous prime is 400387529. The next prime is 400387541. The reversal of 400387540 is 45783004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400387541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105801 + ... + 109519.

It is an arithmetic number, because the mean of its divisors is an integer number (20050800).

Almost surely, 2^400387540 is an apocalyptic number.

It is an amenable number.

400387540 is an abundant number, since it is smaller than the sum of its proper divisors (562050860).

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

400387540 is a wasteful number, since it uses less digits than its factorization.

400387540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504 (or 4502 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 400387540 is about 20009.6861544603. The cubic root of 400387540 is about 737.0441745174.

The spelling of 400387540 in words is "four hundred million, three hundred eighty-seven thousand, five hundred forty".