12400290 has 96 divisors (see below), whose sum is σ = 38263680. Its totient is φ = 2834352.

The previous prime is 12400247. The next prime is 12400303. The reversal of 12400290 is 9200421.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1771467 + ... + 1771473.

It is an arithmetic number, because the mean of its divisors is an integer number (398580).

Almost surely, 2^12400290 is an apocalyptic number.

12400290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12400290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19131840).

12400290 is an abundant number, since it is smaller than the sum of its proper divisors (25863390).

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

12400290 is an frugal number, since it uses more digits than its factorization.

12400290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47 (or 17 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12400290 is about 3521.4045493240. The cubic root of 12400290 is about 231.4607098225.

The spelling of 12400290 in words is "twelve million, four hundred thousand, two hundred ninety".