400349790 has 96 divisors (see below), whose sum is σ = 1096018560. Its totient is φ = 105123744.

The previous prime is 400349783. The next prime is 400349791. The reversal of 400349790 is 97943004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400349791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161581 + ... + 164039.

It is an arithmetic number, because the mean of its divisors is an integer number (11416860).

Almost surely, 2^400349790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400349790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (548009280).

400349790 is an abundant number, since it is smaller than the sum of its proper divisors (695668770).

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

400349790 is a wasteful number, since it uses less digits than its factorization.

400349790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548 (or 2536 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 400349790 is about 20008.7428390691. The cubic root of 400349790 is about 737.0210100503.

The spelling of 400349790 in words is "four hundred million, three hundred forty-nine thousand, seven hundred ninety".