38400020 has 12 divisors (see below), whose sum is σ = 80640084. Its totient is φ = 15360000.

The previous prime is 38399983. The next prime is 38400023. The reversal of 38400020 is 2000483.

It can be written as a sum of positive squares in 2 ways, for example, as 14409616 + 23990404 = 3796^2 + 4898^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38400023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959981 + ... + 960020.

It is an arithmetic number, because the mean of its divisors is an integer number (6720007).

Almost surely, 2^38400020 is an apocalyptic number.

It is an amenable number.

38400020 is an abundant number, since it is smaller than the sum of its proper divisors (42240064).

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

38400020 is a wasteful number, since it uses less digits than its factorization.

38400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920010 (or 1920008 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 38400020 is about 6196.7749676747. The cubic root of 38400020 is about 337.3731246924.

The spelling of 38400020 in words is "thirty-eight million, four hundred thousand, twenty".