748129221 has 48 divisors (see below), whose sum is σ = 1266929664. Its totient is φ = 416536992.

The previous prime is 748129141. The next prime is 748129229. The reversal of 748129221 is 122921847.

748129221 is a nontrivial binomial coefficient, being equal to C(38682, 2).

It is a de Polignac number, because none of the positive numbers 2^k-748129221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (748129229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 908616 + ... + 909438.

It is an arithmetic number, because the mean of its divisors is an integer number (26394368).

Almost surely, 2^748129221 is an apocalyptic number.

748129221 is the 38681-st triangular number and also the 19341-st hexagonal number.

It is an amenable number.

748129221 is a deficient number, since it is larger than the sum of its proper divisors (518800443).

748129221 is a wasteful number, since it uses less digits than its factorization.

748129221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190 (or 1187 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 748129221 is about 27351.9509541824. The cubic root of 748129221 is about 907.8042383159.

The spelling of 748129221 in words is "seven hundred forty-eight million, one hundred twenty-nine thousand, two hundred twenty-one".