1047997440 has 660 divisors, whose sum is σ = 4529699856. Its totient is φ = 226934784.

The previous prime is 1047997411. The next prime is 1047997463. The reversal of 1047997440 is 447997401.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 55157751 + ... + 55157769.

Almost surely, 2^1047997440 is an apocalyptic number.

1047997440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1047997440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2264849928).

1047997440 is an abundant number, since it is smaller than the sum of its proper divisors (3481702416).

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

1047997440 is an equidigital number, since it uses as much as digits as its factorization.

1047997440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1047997440 is about 32372.7885731211. The cubic root of 1047997440 is about 1015.7497885516.

The spelling of 1047997440 in words is "one billion, forty-seven million, nine hundred ninety-seven thousand, four hundred forty".