378806981 has 8 divisors (see below), whose sum is σ = 442133760. Its totient is φ = 317783088.

The previous prime is 378806977. The next prime is 378807029. The reversal of 378806981 is 189608873.

378806981 = T₃₃₅ + T₃₃₆ + ... + T₁₃₂₁.

It is a happy number.

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

It is not a de Polignac number, because 378806981 - 2² = 378806977 is a prime.

It is a super-2 number, since 2×378806981² = 286989457708668722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378806921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575366 + ... + 576023.

It is an arithmetic number, because the mean of its divisors is an integer number (55266720).

Almost surely, 2^378806981 is an apocalyptic number.

It is an amenable number.

378806981 is a deficient number, since it is larger than the sum of its proper divisors (63326779).

378806981 is a wasteful number, since it uses less digits than its factorization.

378806981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151443.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 378806981 is about 19462.9643425661. The cubic root of 378806981 is about 723.5568476625.

The spelling of 378806981 in words is "three hundred seventy-eight million, eight hundred six thousand, nine hundred eighty-one".