11961400 has 48 divisors (see below), whose sum is σ = 30344040. Its totient is φ = 4348800.

The previous prime is 11961377. The next prime is 11961401. The reversal of 11961400 is 416911.

11961400 = T₂₄₁ + T₂₄₂ + ... + T₄₄₀.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961401) 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, 519 + ... + 4918.

Almost surely, 2^11961400 is an apocalyptic number.

11961400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11961400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15172020).

11961400 is an abundant number, since it is smaller than the sum of its proper divisors (18382640).

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

11961400 is a wasteful number, since it uses less digits than its factorization.

11961400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464 (or 5455 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 11961400 is about 3458.5256974613. The cubic root of 11961400 is about 228.6971072230.

The spelling of 11961400 in words is "eleven million, nine hundred sixty-one thousand, four hundred".