400440288 has 48 divisors (see below), whose sum is σ = 1053997056. Its totient is φ = 133119360.

The previous prime is 400440277. The next prime is 400440289. The reversal of 400440288 is 882044004.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400440289) 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, 31323 + ... + 42213.

It is an arithmetic number, because the mean of its divisors is an integer number (21958272).

Almost surely, 2^400440288 is an apocalyptic number.

400440288 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

400440288 is an abundant number, since it is smaller than the sum of its proper divisors (653556768).

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

400440288 is a wasteful number, since it uses less digits than its factorization.

400440288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11287 (or 11279 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 400440288 is about 20011.0041727046. The cubic root of 400440288 is about 737.0765397429.

The spelling of 400440288 in words is "four hundred million, four hundred forty thousand, two hundred eighty-eight".