381721450 has 24 divisors (see below), whose sum is σ = 774548640. Its totient is φ = 138807600.

The previous prime is 381721429. The next prime is 381721463. The reversal of 381721450 is 54127183.

It is a super-2 number, since 2×381721450² = 291422530780205000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346470 + ... + 347569.

It is an arithmetic number, because the mean of its divisors is an integer number (32272860).

Almost surely, 2^381721450 is an apocalyptic number.

381721450 is an abundant number, since it is smaller than the sum of its proper divisors (392827190).

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

381721450 is a wasteful number, since it uses less digits than its factorization.

381721450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694062 (or 694057 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 381721450 is about 19537.6930572675. The cubic root of 381721450 is about 725.4077452715.

The spelling of 381721450 in words is "three hundred eighty-one million, seven hundred twenty-one thousand, four hundred fifty".