690387 has 8 divisors (see below), whose sum is σ = 974736. Its totient is φ = 433152.

The previous prime is 690377. The next prime is 690397. The reversal of 690387 is 783096.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (690377) and next prime (690397).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690387 - 2⁶ = 690323 is a prime.

It is an alternating number because its digits alternate between even and odd.

690387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (690367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6718 + ... + 6819.

It is an arithmetic number, because the mean of its divisors is an integer number (121842).

2⁶⁹⁰³⁸⁷ is an apocalyptic number.

690387 is a deficient number, since it is larger than the sum of its proper divisors (284349).

690387 is a wasteful number, since it uses less digits than its factorization.

690387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13557.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 690387 is about 830.8953002635. The cubic root of 690387 is about 88.3820766540.

The spelling of 690387 in words is "six hundred ninety thousand, three hundred eighty-seven".