390706140 has 96 divisors (see below), whose sum is σ = 1204600320. Its totient is φ = 93830400.

The previous prime is 390706123. The next prime is 390706157. The reversal of 390706140 is 41607093.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (390706123) and next prime (390706157).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 390706098 and 390706107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69225 + ... + 74655.

It is an arithmetic number, because the mean of its divisors is an integer number (12547920).

Almost surely, 2^390706140 is an apocalyptic number.

390706140 is a gapful number since it is divisible by the number (30) 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 390706140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602300160).

390706140 is an abundant number, since it is smaller than the sum of its proper divisors (813894180).

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

390706140 is a wasteful number, since it uses less digits than its factorization.

390706140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563 (or 5561 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 390706140 is about 19766.2879671424. The cubic root of 390706140 is about 731.0550454063.

The spelling of 390706140 in words is "three hundred ninety million, seven hundred six thousand, one hundred forty".