290405388 has 96 divisors (see below), whose sum is σ = 845641216. Its totient is φ = 75520512.

The previous prime is 290405371. The next prime is 290405393. The reversal of 290405388 is 883504092.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 77895 + ... + 81537.

Almost surely, 2^290405388 is an apocalyptic number.

290405388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 290405388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (422820608).

290405388 is an abundant number, since it is smaller than the sum of its proper divisors (555235828).

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

290405388 is a wasteful number, since it uses less digits than its factorization.

290405388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743 (or 3741 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 290405388 is about 17041.2848107178. The cubic root of 290405388 is about 662.2188771900.

The spelling of 290405388 in words is "two hundred ninety million, four hundred five thousand, three hundred eighty-eight".