38697840 has 120 divisors (see below), whose sum is σ = 131964768. Its totient is φ = 10160640.

The previous prime is 38697839. The next prime is 38697871. The reversal of 38697840 is 4879683.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50742 + ... + 51498.

Almost surely, 2^38697840 is an apocalyptic number.

38697840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38697840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65982384).

38697840 is an abundant number, since it is smaller than the sum of its proper divisors (93266928).

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

38697840 is a wasteful number, since it uses less digits than its factorization.

38697840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 38697840 is about 6220.7587961598. The cubic root of 38697840 is about 338.2430706066.

The spelling of 38697840 in words is "thirty-eight million, six hundred ninety-seven thousand, eight hundred forty".