1898972774 has 8 divisors (see below), whose sum is σ = 2852295120. Its totient is φ = 948207736.

The previous prime is 1898972773. The next prime is 1898972791. The reversal of 1898972774 is 4772798981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898972771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637469 + ... + 640440.

It is an arithmetic number, because the mean of its divisors is an integer number (356536890).

Almost surely, 2^1898972774 is an apocalyptic number.

1898972774 is a deficient number, since it is larger than the sum of its proper divisors (953322346).

1898972774 is a wasteful number, since it uses less digits than its factorization.

1898972774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278654.

The product of its digits is 14224896, while the sum is 62.

The square root of 1898972774 is about 43577.2047520260. The cubic root of 1898972774 is about 1238.3390817738.

The spelling of 1898972774 in words is "one billion, eight hundred ninety-eight million, nine hundred seventy-two thousand, seven hundred seventy-four".