690439397 has 8 divisors (see below), whose sum is σ = 693888000. Its totient is φ = 686998224.

The previous prime is 690439391. The next prime is 690439403. The reversal of 690439397 is 793934096.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (690439391) and next prime (690439403).

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 690439397 - 2²⁴ = 673662181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690439391) 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, 286604 + ... + 289002.

It is an arithmetic number, because the mean of its divisors is an integer number (86736000).

Almost surely, 2^690439397 is an apocalyptic number.

It is an amenable number.

690439397 is a deficient number, since it is larger than the sum of its proper divisors (3448603).

690439397 is a wasteful number, since it uses less digits than its factorization.

690439397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715.

The product of its (nonzero) digits is 1102248, while the sum is 50.

The square root of 690439397 is about 26276.2135209775. The cubic root of 690439397 is about 883.8431252000.

The spelling of 690439397 in words is "six hundred ninety million, four hundred thirty-nine thousand, three hundred ninety-seven".