1261392 has 40 divisors (see below), whose sum is σ = 3556320. Its totient is φ = 382080.

The previous prime is 1261387. The next prime is 1261411. The reversal of 1261392 is 2931621.

It is a super-2 number, since 2×1261392² = 3182219555328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667 + ... + 1722.

It is an arithmetic number, because the mean of its divisors is an integer number (88908).

2^1261392 is an apocalyptic number.

1261392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261392 is an abundant number, since it is smaller than the sum of its proper divisors (2294928).

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

1261392 is a wasteful number, since it uses less digits than its factorization.

1261392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411 (or 2405 counting only the distinct ones).

The product of its digits is 648, while the sum is 24.

The square root of 1261392 is about 1123.1170909571. The cubic root of 1261392 is about 108.0479896466.

It can be divided in two parts, 1261 and 392, that added together give a triangular number (1653 = T₅₇).

The spelling of 1261392 in words is "one million, two hundred sixty-one thousand, three hundred ninety-two".