1229157988 has 12 divisors (see below), whose sum is σ = 2154609772. Its totient is φ = 613555200.

The previous prime is 1229157971. The next prime is 1229157997. The reversal of 1229157988 is 8897519221.

It can be written as a sum of positive squares in 2 ways, for example, as 1113423424 + 115734564 = 33368^2 + 10758^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253245 + ... + 258052.

Almost surely, 2^1229157988 is an apocalyptic number.

It is an amenable number.

1229157988 is a deficient number, since it is larger than the sum of its proper divisors (925451784).

1229157988 is a wasteful number, since it uses less digits than its factorization.

1229157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511902 (or 511900 counting only the distinct ones).

The product of its digits is 725760, while the sum is 52.

The square root of 1229157988 is about 35059.3495090825. The cubic root of 1229157988 is about 1071.1967243391.

The spelling of 1229157988 in words is "one billion, two hundred twenty-nine million, one hundred fifty-seven thousand, nine hundred eighty-eight".