393690 has 32 divisors (see below), whose sum is σ = 1031616. Its totient is φ = 95360.

The previous prime is 393683. The next prime is 393697. The reversal of 393690 is 96393.

It is an interprime number because it is at equal distance from previous prime (393683) and next prime (393697).

It is a super-2 number, since 2×393690² = 309983632200, which contains 22 as substring.

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

It is a zygodrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (393697) by changing a digit.

393690 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (32238).

2³⁹³⁶⁹⁰ is an apocalyptic number.

393690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

393690 is an abundant number, since it is smaller than the sum of its proper divisors (637926).

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

393690 is a wasteful number, since it uses less digits than its factorization.

393690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 393690 is about 627.4472089347. The cubic root of 393690 is about 73.2911373412.

The spelling of 393690 in words is "three hundred ninety-three thousand, six hundred ninety".