1042172789 has 4 divisors (see below), whose sum is σ = 1191054624. Its totient is φ = 893290956.

The previous prime is 1042172767. The next prime is 1042172801. The reversal of 1042172789 is 9872712401.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9872712401 = 1181 ⋅8359621.

It is a cyclic number.

It is not a de Polignac number, because 1042172789 - 2¹² = 1042168693 is a prime.

It is a super-2 number, since 2×1042172789² = 2172248244264077042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1042172759) 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, 74440907 + ... + 74440920.

It is an arithmetic number, because the mean of its divisors is an integer number (297763656).

Almost surely, 2^1042172789 is an apocalyptic number.

It is an amenable number.

1042172789 is a deficient number, since it is larger than the sum of its proper divisors (148881835).

1042172789 is an equidigital number, since it uses as much as digits as its factorization.

1042172789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148881834.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1042172789 is about 32282.7010796804. The cubic root of 1042172789 is about 1013.8644840534.

The spelling of 1042172789 in words is "one billion, forty-two million, one hundred seventy-two thousand, seven hundred eighty-nine".