742121787 has 8 divisors (see below), whose sum is σ = 1079449920. Its totient is φ = 449770760.

The previous prime is 742121777. The next prime is 742121789. The reversal of 742121787 is 787121247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 742121787 - 2²³ = 733733179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (742121789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11244237 + ... + 11244302.

It is an arithmetic number, because the mean of its divisors is an integer number (134931240).

Almost surely, 2^742121787 is an apocalyptic number.

742121787 is a deficient number, since it is larger than the sum of its proper divisors (337328133).

742121787 is a wasteful number, since it uses less digits than its factorization.

742121787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22488553.

The product of its digits is 43904, while the sum is 39.

The square root of 742121787 is about 27241.9123227427. The cubic root of 742121787 is about 905.3678335446.

The spelling of 742121787 in words is "seven hundred forty-two million, one hundred twenty-one thousand, seven hundred eighty-seven".