1243654016 has 64 divisors (see below), whose sum is σ = 2711882160. Its totient is φ = 563404800.

The previous prime is 1243654003. The next prime is 1243654021. The reversal of 1243654016 is 6104563421.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×1243654016³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473186 + ... + 475806.

Almost surely, 2^1243654016 is an apocalyptic number.

1243654016 is a gapful number since it is divisible by the number (16) 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 1243654016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1355941080).

1243654016 is an abundant number, since it is smaller than the sum of its proper divisors (1468228144).

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

1243654016 is a wasteful number, since it uses less digits than its factorization.

1243654016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983 (or 2971 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1243654016 is about 35265.4790978373. The cubic root of 1243654016 is about 1075.3913169927.

The spelling of 1243654016 in words is "one billion, two hundred forty-three million, six hundred fifty-four thousand, sixteen".