400610540 has 24 divisors (see below), whose sum is σ = 917762832. Its totient is φ = 145676480.

The previous prime is 400610537. The next prime is 400610543. The reversal of 400610540 is 45016004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400610537) and next prime (400610543).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (400610543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910259 + ... + 910698.

It is an arithmetic number, because the mean of its divisors is an integer number (38240118).

Almost surely, 2^400610540 is an apocalyptic number.

It is an amenable number.

400610540 is an abundant number, since it is smaller than the sum of its proper divisors (517152292).

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

400610540 is a wasteful number, since it uses less digits than its factorization.

400610540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1820977 (or 1820975 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 400610540 is about 20015.2576800800. The cubic root of 400610540 is about 737.1809839248.

Adding to 400610540 its reverse (45016004), we get a palindrome (445626544).

The spelling of 400610540 in words is "four hundred million, six hundred ten thousand, five hundred forty".