261873400 has 48 divisors (see below), whose sum is σ = 635338800. Its totient is φ = 100193280.

The previous prime is 261873373. The next prime is 261873407. The reversal of 261873400 is 4378162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261873407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23865 + ... + 33064.

It is an arithmetic number, because the mean of its divisors is an integer number (13236225).

Almost surely, 2^261873400 is an apocalyptic number.

261873400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261873400 is an abundant number, since it is smaller than the sum of its proper divisors (373465400).

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

261873400 is a wasteful number, since it uses less digits than its factorization.

261873400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56968 (or 56959 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 261873400 is about 16182.5028966474. The cubic root of 261873400 is about 639.7797093400.

The spelling of 261873400 in words is "two hundred sixty-one million, eight hundred seventy-three thousand, four hundred".