428149731 has 4 divisors (see below), whose sum is σ = 570866312. Its totient is φ = 285433152.

The previous prime is 428149723. The next prime is 428149739. The reversal of 428149731 is 137941824.

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

It is an interprime number because it is at equal distance from previous prime (428149723) and next prime (428149739).

It is not a de Polignac number, because 428149731 - 2³ = 428149723 is a prime.

It is a super-2 number, since 2×428149731² = 366624384310744722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428149731.

It is not an unprimeable number, because it can be changed into a prime (428149739) 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, 71358286 + ... + 71358291.

It is an arithmetic number, because the mean of its divisors is an integer number (142716578).

Almost surely, 2^428149731 is an apocalyptic number.

428149731 is a deficient number, since it is larger than the sum of its proper divisors (142716581).

428149731 is a wasteful number, since it uses less digits than its factorization.

428149731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142716580.

The product of its digits is 48384, while the sum is 39.

The square root of 428149731 is about 20691.7793096679. The cubic root of 428149731 is about 753.7000750192.

The spelling of 428149731 in words is "four hundred twenty-eight million, one hundred forty-nine thousand, seven hundred thirty-one".