1893863640 has 64 divisors (see below), whose sum is σ = 5686783200. Its totient is φ = 504568832.

The previous prime is 1893863633. The next prime is 1893863641. The reversal of 1893863640 is 463683981.

It is a self number, because there is not a number n which added to its sum of digits gives 1893863640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1893863641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136546 + ... + 149774.

Almost surely, 2^1893863640 is an apocalyptic number.

1893863640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1893863640 is an abundant number, since it is smaller than the sum of its proper divisors (3792919560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1893863640 is a wasteful number, since it uses less digits than its factorization.

1893863640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14436 (or 14432 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 1893863640 is about 43518.5436337201. The cubic root of 1893863640 is about 1237.2275118850.

The spelling of 1893863640 in words is "one billion, eight hundred ninety-three million, eight hundred sixty-three thousand, six hundred forty".