61940407 has 4 divisors (see below), whose sum is σ = 63258336. Its totient is φ = 60622480.

The previous prime is 61940377. The next prime is 61940419. The reversal of 61940407 is 70404916.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-61940407 is a prime.

It is a super-4 number, since 4×61940407⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61940477) 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, 658894 + ... + 658987.

It is an arithmetic number, because the mean of its divisors is an integer number (15814584).

Almost surely, 2^61940407 is an apocalyptic number.

61940407 is a deficient number, since it is larger than the sum of its proper divisors (1317929).

61940407 is a wasteful number, since it uses less digits than its factorization.

61940407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317928.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 61940407 is about 7870.2228049783. Note that the first 3 decimals coincide. The cubic root of 61940407 is about 395.6623124499.

The spelling of 61940407 in words is "sixty-one million, nine hundred forty thousand, four hundred seven".