1261900 has 18 divisors (see below), whose sum is σ = 2738540. Its totient is φ = 504720.

The previous prime is 1261891. The next prime is 1261901. The reversal of 1261900 is 91621.

It is a super-2 number, since 2×1261900² = 3184783220000, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1261901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6210 + ... + 6409.

2^1261900 is an apocalyptic number.

1261900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261900 is an abundant number, since it is smaller than the sum of its proper divisors (1476640).

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

1261900 is a wasteful number, since it uses less digits than its factorization.

1261900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633 (or 12626 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1261900 is about 1123.3432244866. The cubic root of 1261900 is about 108.0624924108.

The spelling of 1261900 in words is "one million, two hundred sixty-one thousand, nine hundred".