431020042 has 4 divisors (see below), whose sum is σ = 646530066. Its totient is φ = 215510020.

The previous prime is 431020027. The next prime is 431020087. The reversal of 431020042 is 240020134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 341547361 + 89472681 = 18481^2 + 9459^2 .

It is a junction number, because it is equal to n+sod(n) for n = 431019998 and 431020025.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107755009 + ... + 107755012.

Almost surely, 2^431020042 is an apocalyptic number.

431020042 is a deficient number, since it is larger than the sum of its proper divisors (215510024).

431020042 is a wasteful number, since it uses less digits than its factorization.

431020042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215510023.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 431020042 is about 20761.0221810006. The cubic root of 431020042 is about 755.3805908285.

Adding to 431020042 its reverse (240020134), we get a palindrome (671040176).

The spelling of 431020042 in words is "four hundred thirty-one million, twenty thousand, forty-two".