381672945 has 64 divisors (see below), whose sum is σ = 713475840. Its totient is φ = 193342464.

The previous prime is 381672923. The next prime is 381672997. The reversal of 381672945 is 549276183.

It is not a de Polignac number, because 381672945 - 2⁶ = 381672881 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 381672945.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 213897 + ... + 215673.

It is an arithmetic number, because the mean of its divisors is an integer number (11148060).

Almost surely, 2^381672945 is an apocalyptic number.

It is an amenable number.

381672945 is a deficient number, since it is larger than the sum of its proper divisors (331802895).

381672945 is a wasteful number, since it uses less digits than its factorization.

381672945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871 (or 1865 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 381672945 is about 19536.4516993235. The cubic root of 381672945 is about 725.3770183342.

The spelling of 381672945 in words is "three hundred eighty-one million, six hundred seventy-two thousand, nine hundred forty-five".