1247791342 has 32 divisors (see below), whose sum is σ = 2160218880. Its totient is φ = 529502400.

The previous prime is 1247791309. The next prime is 1247791361. The reversal of 1247791342 is 2431977421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1247791295 and 1247791304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1186717 + ... + 1187767.

It is an arithmetic number, because the mean of its divisors is an integer number (67506840).

Almost surely, 2^1247791342 is an apocalyptic number.

1247791342 is a deficient number, since it is larger than the sum of its proper divisors (912427538).

1247791342 is a wasteful number, since it uses less digits than its factorization.

1247791342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its digits is 84672, while the sum is 40.

The square root of 1247791342 is about 35324.0901085930. The cubic root of 1247791342 is about 1076.5825163820.

The spelling of 1247791342 in words is "one billion, two hundred forty-seven million, seven hundred ninety-one thousand, three hundred forty-two".