400451240 has 32 divisors (see below), whose sum is σ = 1029732480. Its totient is φ = 137297472.

The previous prime is 400451221. The next prime is 400451257. The reversal of 400451240 is 42154004.

It is a super-2 number, since 2×400451240² = 320722391235075200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714812 + ... + 715371.

It is an arithmetic number, because the mean of its divisors is an integer number (32179140).

Almost surely, 2^400451240 is an apocalyptic number.

400451240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400451240 is an abundant number, since it is smaller than the sum of its proper divisors (629281240).

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

400451240 is a wasteful number, since it uses less digits than its factorization.

400451240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430201 (or 1430197 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 400451240 is about 20011.2778202692. The cubic root of 400451240 is about 737.0832593370.

The spelling of 400451240 in words is "four hundred million, four hundred fifty-one thousand, two hundred forty".