8400438 has 24 divisors (see below), whose sum is σ = 18254808. Its totient is φ = 2791872.

The previous prime is 8400433. The next prime is 8400439. The reversal of 8400438 is 8340048.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10281 + ... + 11067.

It is an arithmetic number, because the mean of its divisors is an integer number (760617).

Almost surely, 2^8400438 is an apocalyptic number.

8400438 is an abundant number, since it is smaller than the sum of its proper divisors (9854370).

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

8400438 is a wasteful number, since it uses less digits than its factorization.

8400438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388 (or 1385 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 8400438 is about 2898.3509104317. The cubic root of 8400438 is about 203.2828044889.

The spelling of 8400438 in words is "eight million, four hundred thousand, four hundred thirty-eight".