390247530 has 64 divisors (see below), whose sum is σ = 981393408. Its totient is φ = 99190080.

The previous prime is 390247513. The next prime is 390247531. The reversal of 390247530 is 35742093.

It is a happy number.

It is a super-2 number, since 2×390247530² = 304586269342201800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 390247491 and 390247500.

It is not an unprimeable number, because it can be changed into a prime (390247531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59179 + ... + 65441.

It is an arithmetic number, because the mean of its divisors is an integer number (15334272).

Almost surely, 2^390247530 is an apocalyptic number.

390247530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 390247530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (490696704).

390247530 is an abundant number, since it is smaller than the sum of its proper divisors (591145878).

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

390247530 is a wasteful number, since it uses less digits than its factorization.

390247530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6371.

The product of its (nonzero) digits is 22680, while the sum is 33.

The square root of 390247530 is about 19754.6837484177. The cubic root of 390247530 is about 730.7688964868.

The spelling of 390247530 in words is "three hundred ninety million, two hundred forty-seven thousand, five hundred thirty".