1966357440 has 84 divisors (see below), whose sum is σ = 6763460184. Its totient is φ = 524361216.

The previous prime is 1966357439. The next prime is 1966357453. The reversal of 1966357440 is 447536691.

1966357440 is a `hidden beast` number, since 1 + 9 + 6 + 635 + 7 + 4 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338502 + ... + 344261.

Almost surely, 2^1966357440 is an apocalyptic number.

1966357440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1966357440 is an abundant number, since it is smaller than the sum of its proper divisors (4797102744).

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

1966357440 is a wasteful number, since it uses less digits than its factorization.

1966357440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682786 (or 682773 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 1966357440 is about 44343.6290801734. The cubic root of 1966357440 is about 1252.8165693164.

The spelling of 1966357440 in words is "one billion, nine hundred sixty-six million, three hundred fifty-seven thousand, four hundred forty".