31340429 has 4 divisors (see below), whose sum is σ = 31370976. Its totient is φ = 31309884.

The previous prime is 31340423. The next prime is 31340447. The reversal of 31340429 is 92404313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31340429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31340398 and 31340407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31340423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13679 + ... + 15804.

It is an arithmetic number, because the mean of its divisors is an integer number (7842744).

Almost surely, 2^31340429 is an apocalyptic number.

It is an amenable number.

31340429 is a deficient number, since it is larger than the sum of its proper divisors (30547).

31340429 is a wasteful number, since it uses less digits than its factorization.

31340429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30546.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 31340429 is about 5598.2523165717. The cubic root of 31340429 is about 315.2837922858.

It can be divided in two parts, 313404 and 29, that multiplied together give a triangular number (9088716 = T₄₂₆₃).

The spelling of 31340429 in words is "thirty-one million, three hundred forty thousand, four hundred twenty-nine".