1243155634 has 16 divisors (see below), whose sum is σ = 2256484608. Its totient is φ = 501440832.

The previous prime is 1243155623. The next prime is 1243155643. The reversal of 1243155634 is 4365513421.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 1243155634.

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, 2611434 + ... + 2611909.

It is an arithmetic number, because the mean of its divisors is an integer number (141030288).

Almost surely, 2^1243155634 is an apocalyptic number.

1243155634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1243155634 is a deficient number, since it is larger than the sum of its proper divisors (1013328974).

1243155634 is a wasteful number, since it uses less digits than its factorization.

1243155634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223369.

The product of its digits is 43200, while the sum is 34.

The square root of 1243155634 is about 35258.4122444559. The cubic root of 1243155634 is about 1075.2476470016.

The spelling of 1243155634 in words is "one billion, two hundred forty-three million, one hundred fifty-five thousand, six hundred thirty-four".