31430397 has 8 divisors (see below), whose sum is σ = 43729344. Its totient is φ = 20042528.

The previous prime is 31430393. The next prime is 31430417. The reversal of 31430397 is 79303413.

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 31430397 - 2² = 31430393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31430393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227688 + ... + 227825.

It is an arithmetic number, because the mean of its divisors is an integer number (5466168).

Almost surely, 2^31430397 is an apocalyptic number.

It is an amenable number.

31430397 is a deficient number, since it is larger than the sum of its proper divisors (12298947).

31430397 is a wasteful number, since it uses less digits than its factorization.

31430397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455539.

The product of its (nonzero) digits is 6804, while the sum is 30.

The square root of 31430397 is about 5606.2819229860. The cubic root of 31430397 is about 315.5851958692.

The spelling of 31430397 in words is "thirty-one million, four hundred thirty thousand, three hundred ninety-seven".