1729721412 has 24 divisors (see below), whose sum is σ = 4484463200. Its totient is φ = 576573768.

The previous prime is 1729721393. The next prime is 1729721431. The reversal of 1729721412 is 2141279271.

1729721412 is a `hidden beast` number, since 172 + 9 + 72 + 1 + 412 = 666.

It is an interprime number because it is at equal distance from previous prime (1729721393) and next prime (1729721431).

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

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, 8007862 + ... + 8008077.

Almost surely, 2^1729721412 is an apocalyptic number.

1729721412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1729721412 is an abundant number, since it is smaller than the sum of its proper divisors (2754741788).

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

1729721412 is a wasteful number, since it uses less digits than its factorization.

1729721412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16015952 (or 16015944 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 1729721412 is about 41589.9195959790. The cubic root of 1729721412 is about 1200.3983427546.

The spelling of 1729721412 in words is "one billion, seven hundred twenty-nine million, seven hundred twenty-one thousand, four hundred twelve".