1247723428 has 12 divisors (see below), whose sum is σ = 2495446912. Its totient is φ = 534738600.

The previous prime is 1247723423. The next prime is 1247723437. The reversal of 1247723428 is 8243277421.

1247723428 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1247723423) 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, 22280748 + ... + 22280803.

Almost surely, 2^1247723428 is an apocalyptic number.

It is an amenable number.

1247723428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247723428 is a wasteful number, since it uses less digits than its factorization.

1247723428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44561562 (or 44561560 counting only the distinct ones).

The product of its digits is 150528, while the sum is 40.

The square root of 1247723428 is about 35323.1287968662. The cubic root of 1247723428 is about 1076.5629841763.

The spelling of 1247723428 in words is "one billion, two hundred forty-seven million, seven hundred twenty-three thousand, four hundred twenty-eight".