1870381 has 2 divisors, whose sum is σ = 1870382. Its totient is φ = 1870380.

The previous prime is 1870373. The next prime is 1870399. The reversal of 1870381 is 1830781.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 320356 = 1245^2 + 566^2 .

It is a cyclic number.

It is not a de Polignac number, because 1870381 - 2³ = 1870373 is a prime.

It is a super-2 number, since 2×1870381² = 6996650170322, which contains 22 as substring.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1870361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935190 + 935191.

It is an arithmetic number, because the mean of its divisors is an integer number (935191).

2^1870381 is an apocalyptic number.

It is an amenable number.

1870381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1870381 is an equidigital number, since it uses as much as digits as its factorization.

1870381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 1870381 is about 1367.6187334195. The cubic root of 1870381 is about 123.2092632673.

The spelling of 1870381 in words is "one million, eight hundred seventy thousand, three hundred eighty-one".