690817939 has 8 divisors (see below), whose sum is σ = 790580480. Its totient is φ = 591323976.

The previous prime is 690817931. The next prime is 690817943. The reversal of 690817939 is 939718096.

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

It is a cyclic number.

It is not a de Polignac number, because 690817939 - 2³ = 690817931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690817931) 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, 61599 + ... + 71944.

It is an arithmetic number, because the mean of its divisors is an integer number (98822560).

Almost surely, 2^690817939 is an apocalyptic number.

690817939 is a deficient number, since it is larger than the sum of its proper divisors (99762541).

690817939 is a wasteful number, since it uses less digits than its factorization.

690817939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134289.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 690817939 is about 26283.4156646354. The cubic root of 690817939 is about 884.0046216905.

The spelling of 690817939 in words is "six hundred ninety million, eight hundred seventeen thousand, nine hundred thirty-nine".