1821430736 has 10 divisors (see below), whose sum is σ = 3529022082. Its totient is φ = 910715360.

The previous prime is 1821430729. The next prime is 1821430739. The reversal of 1821430736 is 6370341281.

It can be written as a sum of positive squares in only one way, i.e., 1676083600 + 145347136 = 40940^2 + 12056^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1821430696 and 1821430705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821430739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56919695 + ... + 56919726.

Almost surely, 2^1821430736 is an apocalyptic number.

1821430736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1821430736 is a deficient number, since it is larger than the sum of its proper divisors (1707591346).

1821430736 is a wasteful number, since it uses less digits than its factorization.

1821430736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113839429 (or 113839423 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1821430736 is about 42678.2232057521. The cubic root of 1821430736 is about 1221.2489976863.

The spelling of 1821430736 in words is "one billion, eight hundred twenty-one million, four hundred thirty thousand, seven hundred thirty-six".