1646534340 has 72 divisors (see below), whose sum is σ = 5448538368. Its totient is φ = 399159360.

The previous prime is 1646534311. The next prime is 1646534399. The reversal of 1646534340 is 434356461.

1646534340 is a `hidden beast` number, since 1 + 646 + 5 + 3 + 4 + 3 + 4 + 0 = 666.

It is a super-2 number, since 2×1646534340² = 5422150665598471200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1646534295 and 1646534304.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 413812 + ... + 417771.

It is an arithmetic number, because the mean of its divisors is an integer number (75674144).

Almost surely, 2^1646534340 is an apocalyptic number.

1646534340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646534340 is an abundant number, since it is smaller than the sum of its proper divisors (3802004028).

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

1646534340 is a wasteful number, since it uses less digits than its factorization.

1646534340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831609 (or 831604 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 1646534340 is about 40577.5102735493. The cubic root of 1646534340 is about 1180.8378469731.

It can be divided in two parts, 16465 and 34340, that added together give a palindrome (50805).

The spelling of 1646534340 in words is "one billion, six hundred forty-six million, five hundred thirty-four thousand, three hundred forty".