1245109440 has 112 divisors (see below), whose sum is σ = 3968057088. Its totient is φ = 330783744.

The previous prime is 1245109429. The next prime is 1245109469. The reversal of 1245109440 is 449015421.

It is a super-2 number, since 2×1245109440² = 3100595035154227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1245109398 and 1245109407.

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, 269389 + ... + 273971.

Almost surely, 2^1245109440 is an apocalyptic number.

1245109440 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 1245109440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1984028544).

1245109440 is an abundant number, since it is smaller than the sum of its proper divisors (2722947648).

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

1245109440 is a wasteful number, since it uses less digits than its factorization.

1245109440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4886 (or 4876 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1245109440 is about 35286.1083147462. The cubic root of 1245109440 is about 1075.8106566037.

It can be divided in two parts, 1245 and 109440, that added together give a triangular number (110685 = T₄₇₀).

The spelling of 1245109440 in words is "one billion, two hundred forty-five million, one hundred nine thousand, four hundred forty".