61397140 has 24 divisors (see below), whose sum is σ = 147353472. Its totient is φ = 21050400.

The previous prime is 61397137. The next prime is 61397159. The reversal of 61397140 is 4179316.

It is a happy number.

It is a congruent number.

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, 219136 + ... + 219415.

It is an arithmetic number, because the mean of its divisors is an integer number (6139728).

Almost surely, 2^61397140 is an apocalyptic number.

It is an amenable number.

61397140 is an abundant number, since it is smaller than the sum of its proper divisors (85956332).

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

61397140 is a wasteful number, since it uses less digits than its factorization.

61397140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438567 (or 438565 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 61397140 is about 7835.6327121682. The cubic root of 61397140 is about 394.5021554711.

The spelling of 61397140 in words is "sixty-one million, three hundred ninety-seven thousand, one hundred forty".