1798421940 has 120 divisors (see below), whose sum is σ = 6447716352. Its totient is φ = 411065280.

The previous prime is 1798421923. The next prime is 1798421951. The reversal of 1798421940 is 491248971.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 67956 + ... + 90635.

Almost surely, 2^1798421940 is an apocalyptic number.

1798421940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1798421940 is an abundant number, since it is smaller than the sum of its proper divisors (4649294412).

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

1798421940 is a wasteful number, since it uses less digits than its factorization.

1798421940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158619 (or 158608 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1798421940 is about 42407.8051778207. The cubic root of 1798421940 is about 1216.0848107470.

The spelling of 1798421940 in words is "one billion, seven hundred ninety-eight million, four hundred twenty-one thousand, nine hundred forty".