61398 has 20 divisors (see below), whose sum is σ = 137940. Its totient is φ = 20412.

The previous prime is 61381. The next prime is 61403. The reversal of 61398 is 89316.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

61398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 28 + ... + 351.

It is an arithmetic number, because the mean of its divisors is an integer number (6897).

2⁶¹³⁹⁸ is an apocalyptic number.

61398 is an abundant number, since it is smaller than the sum of its proper divisors (76542).

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

61398 is a wasteful number, since it uses less digits than its factorization.

61398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 384 counting only the distinct ones).

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

The square root of 61398 is about 247.7861981629. The cubic root of 61398 is about 39.4503997415.

Adding to 61398 its sum of digits (27), we get a triangular number (61425 = T₃₅₀).

The spelling of 61398 in words is "sixty-one thousand, three hundred ninety-eight".