400123240 has 32 divisors (see below), whose sum is σ = 982121760. Its totient is φ = 145499200.

The previous prime is 400123219. The next prime is 400123277. The reversal of 400123240 is 42321004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454246 + ... + 455125.

It is an arithmetic number, because the mean of its divisors is an integer number (30691305).

Almost surely, 2^400123240 is an apocalyptic number.

400123240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400123240 is an abundant number, since it is smaller than the sum of its proper divisors (581998520).

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

400123240 is a wasteful number, since it uses less digits than its factorization.

400123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909393 (or 909389 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 400123240 is about 20003.0807627225. The cubic root of 400123240 is about 736.8819619651.

Adding to 400123240 its reverse (42321004), we get a palindrome (442444244).

The spelling of 400123240 in words is "four hundred million, one hundred twenty-three thousand, two hundred forty".