1720418431 has 4 divisors (see below), whose sum is σ = 1720947664. Its totient is φ = 1719889200.

The previous prime is 1720418387. The next prime is 1720418443. The reversal of 1720418431 is 1348140271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1348140271 = 6287 ⋅214433.

It is a cyclic number.

It is not a de Polignac number, because 1720418431 - 2¹⁵ = 1720385663 is a prime.

It is a super-2 number, since 2×1720418431² = 5919679155449003522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720418393 and 1720418402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720418131) 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, 259710 + ... + 266251.

It is an arithmetic number, because the mean of its divisors is an integer number (430236916).

Almost surely, 2^1720418431 is an apocalyptic number.

1720418431 is a deficient number, since it is larger than the sum of its proper divisors (529233).

1720418431 is an equidigital number, since it uses as much as digits as its factorization.

1720418431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529232.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 1720418431 is about 41477.9270335440. The cubic root of 1720418431 is about 1198.2424342348.

The spelling of 1720418431 in words is "one billion, seven hundred twenty million, four hundred eighteen thousand, four hundred thirty-one".