1234721157 has 16 divisors (see below), whose sum is σ = 1654685760. Its totient is φ = 818963712.

The previous prime is 1234721107. The next prime is 1234721207. The reversal of 1234721157 is 7511274321.

It is an interprime number because it is at equal distance from previous prime (1234721107) and next prime (1234721207).

It is not a de Polignac number, because 1234721157 - 2¹⁰ = 1234720133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234721107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624823 + ... + 626795.

It is an arithmetic number, because the mean of its divisors is an integer number (103417860).

Almost surely, 2^1234721157 is an apocalyptic number.

It is an amenable number.

1234721157 is a deficient number, since it is larger than the sum of its proper divisors (419964603).

1234721157 is a wasteful number, since it uses less digits than its factorization.

1234721157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932.

The product of its digits is 11760, while the sum is 33.

The square root of 1234721157 is about 35138.5992464128. The cubic root of 1234721157 is about 1072.8103711028.

Adding to 1234721157 its reverse (7511274321), we get a palindrome (8745995478).

The spelling of 1234721157 in words is "one billion, two hundred thirty-four million, seven hundred twenty-one thousand, one hundred fifty-seven".