1247247740 has 12 divisors (see below), whose sum is σ = 2619220296. Its totient is φ = 498899088.

The previous prime is 1247247739. The next prime is 1247247751. The reversal of 1247247740 is 477427421.

It is a junction number, because it is equal to n+sod(n) for n = 1247247694 and 1247247703.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31181174 + ... + 31181213.

It is an arithmetic number, because the mean of its divisors is an integer number (218268358).

Almost surely, 2^1247247740 is an apocalyptic number.

1247247740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1247247740 is an abundant number, since it is smaller than the sum of its proper divisors (1371972556).

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

1247247740 is a wasteful number, since it uses less digits than its factorization.

1247247740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62362396 (or 62362394 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 38.

The square root of 1247247740 is about 35316.3947763641. The cubic root of 1247247740 is about 1076.4261554597.

The spelling of 1247247740 in words is "one billion, two hundred forty-seven million, two hundred forty-seven thousand, seven hundred forty".