1977381 has 12 divisors (see below), whose sum is σ = 3264352. Its totient is φ = 1129896.

The previous prime is 1977361. The next prime is 1977403. The reversal of 1977381 is 1837791.

It is not a de Polignac number, because 1977381 - 2⁹ = 1976869 is a prime.

It is a super-2 number, since 2×1977381² = 7820071238322, which contains 22 as substring.

1977381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15631 + ... + 15756.

2^1977381 is an apocalyptic number.

It is an amenable number.

1977381 is a deficient number, since it is larger than the sum of its proper divisors (1286971).

1977381 is a wasteful number, since it uses less digits than its factorization.

1977381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31400 (or 31397 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 1977381 is about 1406.1937988770. The cubic root of 1977381 is about 125.5153338618.

It can be divided in two parts, 19773 and 81, that multiplied together give a cube (1601613 = 117³).

The spelling of 1977381 in words is "one million, nine hundred seventy-seven thousand, three hundred eighty-one".