981388 has 24 divisors (see below), whose sum is σ = 1862000. Its totient is φ = 451008.

The previous prime is 981377. The next prime is 981391. The reversal of 981388 is 883189.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2638 + ... + 2986.

2⁹⁸¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

981388 is a deficient number, since it is larger than the sum of its proper divisors (880612).

981388 is a wasteful number, since it uses less digits than its factorization.

981388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 407 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 981388 is about 990.6502914753. The cubic root of 981388 is about 99.3757107395.

It can be divided in two parts, 981 and 388, that multiplied together give a triangular number (380628 = T₈₇₂).

The spelling of 981388 in words is "nine hundred eighty-one thousand, three hundred eighty-eight".