31400245 has 8 divisors (see below), whose sum is σ = 37843416. Its totient is φ = 25011456.

The previous prime is 31400233. The next prime is 31400249. The reversal of 31400245 is 54200413.

It can be written as a sum of positive squares in 4 ways, for example, as 2056356 + 29343889 = 1434^2 + 5417^2 .

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 31400245 - 2⁹ = 31399733 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 (31400249) 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, 12312 + ... + 14641.

It is an arithmetic number, because the mean of its divisors is an integer number (4730427).

Almost surely, 2^31400245 is an apocalyptic number.

It is an amenable number.

31400245 is a deficient number, since it is larger than the sum of its proper divisors (6443171).

31400245 is a wasteful number, since it uses less digits than its factorization.

31400245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27191.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31400245 is about 5603.5921514686. The cubic root of 31400245 is about 315.4842472103.

Adding to 31400245 its reverse (54200413), we get a palindrome (85600658).

The spelling of 31400245 in words is "thirty-one million, four hundred thousand, two hundred forty-five".