90409340 has 48 divisors (see below), whose sum is σ = 217749504. Its totient is φ = 30888000.

The previous prime is 90409339. The next prime is 90409369. The reversal of 90409340 is 4390409.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45365 + ... + 47315.

It is an arithmetic number, because the mean of its divisors is an integer number (4536448).

Almost surely, 2^90409340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90409340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108874752).

90409340 is an abundant number, since it is smaller than the sum of its proper divisors (127340164).

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

90409340 is a wasteful number, since it uses less digits than its factorization.

90409340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298 (or 2296 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 90409340 is about 9508.3826174592. The cubic root of 90409340 is about 448.8188613635.

Adding to 90409340 its reverse (4390409), we get a palindrome (94799749).

The spelling of 90409340 in words is "ninety million, four hundred nine thousand, three hundred forty".