38997440 has 28 divisors (see below), whose sum is σ = 92863416. Its totient is φ = 15598848.

The previous prime is 38997419. The next prime is 38997449. The reversal of 38997440 is 4479983.

It is a junction number, because it is equal to n+sod(n) for n = 38997391 and 38997400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38997449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60614 + ... + 61253.

Almost surely, 2^38997440 is an apocalyptic number.

It is an amenable number.

38997440 is an abundant number, since it is smaller than the sum of its proper divisors (53865976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38997440 is a wasteful number, since it uses less digits than its factorization.

38997440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121884 (or 121874 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 38997440 is about 6244.7930309979. The cubic root of 38997440 is about 339.1137240525.

The spelling of 38997440 in words is "thirty-eight million, nine hundred ninety-seven thousand, four hundred forty".