38021391 has 24 divisors (see below), whose sum is σ = 56687904. Its totient is φ = 24541440.

The previous prime is 38021383. The next prime is 38021437. The reversal of 38021391 is 19312083.

It is not a de Polignac number, because 38021391 - 2³ = 38021383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38021341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61315 + ... + 61931.

It is an arithmetic number, because the mean of its divisors is an integer number (2361996).

Almost surely, 2^38021391 is an apocalyptic number.

38021391 is a deficient number, since it is larger than the sum of its proper divisors (18666513).

38021391 is a wasteful number, since it uses less digits than its factorization.

38021391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 38021391 is about 6166.1487980749. The cubic root of 38021391 is about 336.2606130709.

The spelling of 38021391 in words is "thirty-eight million, twenty-one thousand, three hundred ninety-one".