1245781332 has 18 divisors (see below), whose sum is σ = 3149058458. Its totient is φ = 415260432.

The previous prime is 1245781331. The next prime is 1245781343. The reversal of 1245781332 is 2331875421.

1245781332 is a `hidden beast` number, since 1 + 245 + 7 + 81 + 332 = 666.

It can be written as a sum of positive squares in only one way, i.e., 750540816 + 495240516 = 27396^2 + 22254^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1245781332² = 3103942254319388448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 34605037 = 1245781332 / (1 + 2 + 4 + 5 + 7 + 8 + 1 + 3 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245781331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17302483 + ... + 17302554.

Almost surely, 2^1245781332 is an apocalyptic number.

1245781332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1245781332 is an abundant number, since it is smaller than the sum of its proper divisors (1903277126).

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

1245781332 is a wasteful number, since it uses less digits than its factorization.

1245781332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34605047 (or 34605042 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 1245781332 is about 35295.6276612274. The cubic root of 1245781332 is about 1076.0041331958.

The spelling of 1245781332 in words is "one billion, two hundred forty-five million, seven hundred eighty-one thousand, three hundred thirty-two".