1451991380 has 48 divisors (see below), whose sum is σ = 3636299520. Its totient is φ = 476179968.

The previous prime is 1451991379. The next prime is 1451991383. The reversal of 1451991380 is 831991541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451991383) 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, 222245 + ... + 228684.

It is an arithmetic number, because the mean of its divisors is an integer number (75756240).

Almost surely, 2^1451991380 is an apocalyptic number.

1451991380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1451991380 is an abundant number, since it is smaller than the sum of its proper divisors (2184308140).

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

1451991380 is a wasteful number, since it uses less digits than its factorization.

1451991380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450968 (or 450966 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 1451991380 is about 38105.0046581811. The cubic root of 1451991380 is about 1132.3691074091.

The spelling of 1451991380 in words is "one billion, four hundred fifty-one million, nine hundred ninety-one thousand, three hundred eighty".