390340840 has 64 divisors (see below), whose sum is σ = 909941760. Its totient is φ = 150543360.

The previous prime is 390340837. The next prime is 390340877. The reversal of 390340840 is 48043093.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536557 + ... + 537283.

It is an arithmetic number, because the mean of its divisors is an integer number (14217840).

Almost surely, 2^390340840 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 390340840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454970880).

390340840 is an abundant number, since it is smaller than the sum of its proper divisors (519600920).

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

390340840 is a wasteful number, since it uses less digits than its factorization.

390340840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 390340840 is about 19757.0453256554. The cubic root of 390340840 is about 730.8271352597.

The spelling of 390340840 in words is "three hundred ninety million, three hundred forty thousand, eight hundred forty".