690431 has 8 divisors (see below), whose sum is σ = 804384. Its totient is φ = 580320.

The previous prime is 690427. The next prime is 690433. The reversal of 690431 is 134096.

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 690431 - 2² = 690427 is a prime.

It is a super-2 number, since 2×690431² = 953389931522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690397 and 690406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690433) 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, 560 + ... + 1301.

It is an arithmetic number, because the mean of its divisors is an integer number (100548).

2⁶⁹⁰⁴³¹ is an apocalyptic number.

690431 is a deficient number, since it is larger than the sum of its proper divisors (113953).

690431 is a wasteful number, since it uses less digits than its factorization.

690431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 690431 is about 830.9217773052. The cubic root of 690431 is about 88.3839542138.

The spelling of 690431 in words is "six hundred ninety thousand, four hundred thirty-one".