42403431 has 8 divisors (see below), whose sum is σ = 64614784. Its totient is φ = 24230520.

The previous prime is 42403409. The next prime is 42403433. The reversal of 42403431 is 13430424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42403431 - 2⁵ = 42403399 is a prime.

It is a super-2 number, since 2×42403431² = 3596101921143522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 2019211 = 42403431 / (4 + 2 + 4 + 0 + 3 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42403398 and 42403407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42403433) 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, 1009585 + ... + 1009626.

It is an arithmetic number, because the mean of its divisors is an integer number (8076848).

Almost surely, 2^42403431 is an apocalyptic number.

42403431 is a deficient number, since it is larger than the sum of its proper divisors (22211353).

42403431 is a wasteful number, since it uses less digits than its factorization.

42403431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019221.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 42403431 is about 6511.7916889286. The cubic root of 42403431 is about 348.7120856510.

Adding to 42403431 its reverse (13430424), we get a palindrome (55833855).

The spelling of 42403431 in words is "forty-two million, four hundred three thousand, four hundred thirty-one".